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Add vector test

[InstCombine] Fold trunc(ctpop(A)) + trunc(ctpop(B)) -> trunc(ctpop(A) + ctpop(B))

This allows the combine added in #231321 to kick in and fold the motivating ctpop case in automotive-bitcount:

```c
static char bits[256] = {0, 1, 1, 2, 1, 2, 2, 3, 1, 2, 2, 3, 2, 3, 3, 4, 1, 2, 2, 3, 2, 3, 3, 4, 2, 3, 3, 4, 3, 4, 4, 5, 1, 2, 2, 3, 2, 3, 3, 4, 2, 3, 3, 4, 3, 4, 4, 5, 2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6, 1, 2, 2, 3, 2, 3, 3, 4, 2, 3, 3, 4, 3, 4, 4, 5, 2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6, 2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6, 3, 4, 4, 5, 4, 5, 5, 6, 4, 5, 5, 6, 5, 6, 6, 7, 1, 2, 2, 3, 2, 3, 3, 4, 2, 3, 3, 4, 3, 4, 4, 5, 2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6, 2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6, 3, 4, 4, 5, 4, 5, 5, 6, 4, 5, 5, 6, 5, 6, 6, 7, 2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6, 3, 4, 4, 5, 4, 5, 5, 6, 4, 5, 5, 6, 5, 6, 6, 7, 3, 4, 4, 5, 4, 5, 5, 6, 4, 5, 5, 6, 5, 6, 6, 7, 4, 5, 5, 6, 5, 6, 6, 7, 5, 6, 6, 7, 6, 7, 7, 8};

int CDECL ntbl_bitcount(long int x)
{
      return
            bits[ (int) (x & 0x0000000FUL)       ] +
            bits[ (int)((x & 0x000000F0UL) >> 4) ] +
            bits[ (int)((x & 0x00000F00UL) >> 8) ] +
            bits[ (int)((x & 0x0000F000UL) >> 12)] +
            bits[ (int)((x & 0x000F0000UL) >> 16)] +
            bits[ (int)((x & 0x00F00000UL) >> 20)] +
            bits[ (int)((x & 0x0F000000UL) >> 24)] +
            bits[ (int)((x & 0xF0000000UL) >> 28)];
}
```

Precommit tests

[lldb] Add jLLDBSettings remote packet (#229179)

## Summary

Add the negotiated `jLLDBSettings` packet for LLDB-specific settings on
a GDB-remote connection. The initial fields are:

- `dyld_plugin_name`: dynamic-loader plugin LLDB should use.
- `accelerator_plugin_name`: identifies the server-side accelerator
plugin.
- `send_dyld_packet_to_accelerator`: selects the accelerator or native
connection for dynamic-loader queries.

The object can be extended with additional settings. LLDB only sends the
packet when the server advertises `lldb-settings+`; servers that do not
advertise it retain existing behavior.

This is the protocol foundation for #217393.


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[RISCV][P-ext] Remove RISCVISD::PPAIROE_H. NFC (#230356)

This is redundant with RISCVISD::PPAIROE.

Assisted-by: Claude

Remove superfluous comment

[RISCV][P-ext] Combine MHACC_H_B0 and MHACC_W_H0. NFC (#230362)

These semantically do the same operation only with different types.

Assisted-by: Claude

[InstCombine] Fold ctpop((X >> C1) & M1) + ctpop((X >> C2) & M2)

Following up from #231225, automotive-bitcount in llvm-test-suite and GCC use a "per-nibble" ctpop table lookup, where they split the operation up into smaller ctpop table lookups over chunks of the input:

```c
unsigned table_u32(unsigned x) {
  static const unsigned char ctpop[16] = {0, 1, 1, 2, 1, 2, 2, 3, 1, 2, 2, 3, 2, 3, 3, 4};
  return ctpop[x & 15] + ctpop[(x >> 4) & 15];
}
```

PR #231225 now converts the individual table lookups to ctpop intrinsics, so now we're left with `ctpop(X & 0xf) + ctpop((X >> 4) & 0xf) + ctpop((X >> 8) & 0xf) + ...`. We can combine these into `ctpop(X & 0xfff)` provided the extracted bits from X don't overlap.

[AMDGPU] Limit the fmul fusion discount to a matching context type (#229845)

The fmul is free when its context instruction feeds a fusable fadd or
fsub. A vector fmul priced with a scalar lane as the context inherits
that fusion only when it is emitted lane by lane. On a packed type the
scalar user does not show that the vector fmul feeds a vector fadd, and
products extracted into a scalar fadd chain keep the packed fmul while
the fma is lost.

[compiler-rt][ARM] Mark optimized FP add/sub asm as superseding aeabi_[df]rsub.c (#230739)

#179921 (`arm/adddf3.S`) and #179929 (`arm/addsf3.S` and
`arm/thumb1/addsf3fast.S`) introduced optimized assembly implementations
for floating-point addition, subtraction, and reversed subtraction
(`__aeabi_drsub` and `__aeabi_frsub`), but omitted `arm/aeabi_drsub.c`
and `arm/aeabi_frsub.c` from `SUPERSEDES` (and `PROVIDES`), causing
duplicate symbol errors during lld linking in Android.

Assisted-by: Gemini

[VPlan] Simplify extracts of the last lane of live-ins (#231312)

Live-ins are single scalars, so simplify their extracts like other
single-scalar live-in values.

This allows reusing a single resume phi for multiple reductions whose
results fold to the same live-in.

Precommit tests

[MLIR][ROCDL] Note the deprecation of the <4 x i32> buffer ops

While we don't have a way to flag a MLIR op as deprecated yet, go
ahead and add a note to the old `<4 x i32>` intriinsic ops that
they're actively deprecated.

AI disclosure: Claude made this edit, though I checked the wording and
wrote up this message.

Co-Authored-By: Claude Opus 5 (1M context) <noreply at anthropic.com>

[AMDGPU][docs] Document the <4 x i32> buffer intrinsic deprecation

Flag the deprecation of <4 x i32> buffer intrinsics in the release
notes, flagging the migration path and the s.buffer.load subtleties.

AI disclosure: Claude did draft some of this, but I deleted basically
all of it and the words are mine

Co-Authored-By: Claude Opus 5 (1M context) <noreply at anthropic.com>

[AI fixup] Test nits

Address review nits from PR #231308 on the deprecation warning tests:
- Use `< %s` instead of passing the file as an argument.
- Keep the RUN lines contiguous and the CHECK lines in one block
  instead of splitting them up with blank lines.
- Fix subject/verb agreement in the header comment.

Co-Authored-By: Claude Opus 5 (1M context) <noreply at anthropic.com>

[AMDGPU] Warn for using <4 x i32> buffer intrinsics

The buffer intrinsics that take their resource as a <4 x i32> have been
documented as deprecated in IntrinsicsAMDGPU.td for some time, but only
in a TableGen comment, so nothing told users about it. They've all got
`ptr addrspace(8)` counterparts now that #209243 landed, so we can be
slightly more official about asking people to move.

The warning lives in AMDGPUAsmPrinter::doInitialization next to the
no-subarch deprecation warning.

We warn once per intrinsic used, not once per call (it'd cause
unbounded warning spam) and not once per declaration (it'd catch the
same intrinsic but with different types repeatedly). We try to be
clever to point at a specific call if we can find one with a debug
location.

Users can pass -amdgpu-warn-deprecated-buffer-intrinsics=0 to suppress
this.

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[AI fixup] Test nits

Address review nits from PR #231308 and clean up stray comment lines:
- Use `< %s` instead of `-o - %s`.
- Spell `-global-isel=0` on the SDAG run lines and `-global-isel=1` on
  the GlobalISel ones, rather than leaving the SDAG lines implicit.
- Drop the runs of bare `;` lines that had accumulated in front of the
  first check of each function. Re-running
  utils/update_llc_test_checks.py does not reintroduce them, and the
  regenerated file is byte-identical to this one.

Co-Authored-By: Claude Opus 5 (1M context) <noreply at anthropic.com>

[AMDGPU][NFC] Add d16 integer coverage for raw.ptr.buffer.load.format

raw.ptr.buffer.load.format didn't have test coverage for the d16
paths, while other related intrinsics (like the non-`.ptr` versions)
did. This commit fixes the issue.

AI disclosure: Claude wrote these tests

Co-Authored-By: Claude Opus 5 (1M context) <noreply at anthropic.com>

[AI fixup] Test nits

Address review nits from PR #231308:
- Use `< %s` instead of `-o - %s`.
- Spell `-global-isel=0` on the SDAG run line and `-global-isel=1` on
  the GlobalISel one, rather than leaving the SDAG line implicit.

Re-running utils/update_llc_test_checks.py produces no check changes,
so this is a run-line-only cleanup.

Co-Authored-By: Claude Opus 5 (1M context) <noreply at anthropic.com>

[AMDGPU] Let llvm.amdgcn.raw.ptr.buffer.load.format also return any type

While llvm.amdgcn.raw.buffer.load.format can handle any type, and so
can llvm.amdgcn.struct.ptr.buffer.load.format,
llvm.amdgcn.raw.ptr.buffer.format is restricted to floats for some
reason, probably somebody forgetting to loosen it.

This commit fixes the issue so integer-format typed loads can migrate
off of the non-pointer intrinsic.

AI disclosure: Claude noticed it when I asked it draft up a stronger
deprecation for the non-ptr intrinsics, and I wrote the commit message.

Co-Authored-By: Claude Opus 5 (1M context) <noreply at anthropic.com>

[AI fixup] Test nits

Address review nits from PR #231308 on the precommit test:
- Use `< %s` instead of passing the file as an argument.
- Spell the SDAG run line's `-global-isel=0` explicitly and pair it
  with `-global-isel=1` instead of bare `-global-isel`.
- Use the same `amdgpu9.00-amd-mesa3d` triple the follow-up commit
  uses, so the diff there is confined to the behavior change.

Co-Authored-By: Claude Opus 5 (1M context) <noreply at anthropic.com>

[AMDGPU][NFC] Pre-commit test for integer raw.ptr.buffer.load.format

llvm.amdgcn.raw.ptr.buffer.load.format is restricted to floats for
some reason, even though it doesn't need to be (per its non-`.ptr`
counterpart). Pre-commit tests for the integer form.

AI disclosure: Claude wrote these tests, I wrote the message, the big
comment is temporary.

Co-Authored-By: Claude Opus 5 (1M context) <noreply at anthropic.com>

[AMDGPU][NFC] Use ptr ops in ptr.buffer.atomic.fadd_rtn_errors.ll

llvm.amdgcn.ptr.buffer.atomic.fadd_rtn_errors.ll had tests that were
using the deprecated `<4 x i32>` intrinsics. This commit fixes the
issue.

AI disclosure: Claude found this and made the change, I wrote this
message and reviewed.

Co-Authored-By: Claude Opus 5 (1M context) <noreply at anthropic.com>

[llvm][test] Add -filetype=null to llc disable-mir-output-verify test (#231305)

The -passes=no-op-machine-function RUN lines did not specify
-filetype=null, causing llc to attempt to write to the source directory
(which fails when the test input directory is read-only). Follow-up to
663669080864 (#228248 ).

[LAA] Include the load types of written pointers in runtime check bounds. (#231039)

canCheckPtrAtRT creates the runtime check pointers of a pointer that is
both loaded and stored only via its write access, with the types in
Accesses[{Ptr, true}]. Those are the stored types only.

Also include the types the pointer is used in loads. Create runtime
checks for the largest fixed and scalable types, if any.

This fixes a miscompile where the pointer is used to load a wider type
than it stores to.

[LV] Allow stride-scaled canonical IV users when preparing the epilogue (#231307)

convertToStridedAccesses computes the base pointer of a strided access
from the canonical IV, as a mul by the stride (simplified to a shl for a
power-of-2 stride). preparePlanForEpilogueVectorLoop asserted that the
canonical IV is only used by its increment, casts, ScalarIVSteps or
DerivedIV, so forcing epilogue vectorization of a loop with a strided
access hit the assertion.

Offsetting the canonical IV by the main loop's resume value is correct
for those users too, as they are linear in the canonical IV. Allow them
in the assertion.

[LV] Add test for FindIV reduction with wrapping truncated IV (NFC). (#231297)

Add a test where the truncated IV's signed range excludes the sentinel
value, but the IV wraps. The min reduction currently returns the wrong
value.

Lower invokes from the Emscripten EH/SjLj pass

Revert "Fall back to the TargetOptions exception model"

This reverts commit f34f3b4742934142115022fc320faa856798d20f.

Fall back to the TargetOptions exception model

Staging change to keep tests working until the full removal