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Reland "[GlobalISel][LLT] Introduce FPInfo for LLT (Enable bfloat, ppc128float and others in GlobalISel) (#155107)" (#188502)

This is a reland of https://github.com/llvm/llvm-project/pull/155107
along with a fix for old gcc builds.

This patch is reverted in
https://github.com/llvm/llvm-project/pull/188344 due to compilation
failures described in
https://github.com/llvm/llvm-project/pull/155107#issuecomment-4121292756

The fix to old gcc builds is to remove `constexpr` modifiers in the
original patch in 0721d8e7768c011b8cf2d4d223ca6eca3392b1f9

[Polly][NFC] Use factory pattern (#190456)

To (theoretically) reduce coupling of Scop and ScopBuilder.

[lld][COFF] Add /discard-section option to discard input sections by name (#189542)

This provides a general mechanism similar to ELF linker scripts'
/DISCARD/ for COFF. Though the intention is to explicitly discard
.llvmbc and .llvmcmd sections. (See discussion in #150897, #188398
for more details.)

[Polly] Assumptions used to derive domain must not be pruned by that domain (#190436)

The code that emits the conditions for whether a statement is executed
by checking whether we are in the statement's domain may apply
assumptions (such as an integer truncation being reversible). Later code
then assumes that these assumptions are only relevent for then the
statement is executed, but actually it is used for determining whether
it is executed.

Break this circular reasoning by introducing an `IsInsideDomain` flag
that can be set when the domain has not been verified yet.

Fixes #190128

Thanks to @thapgua for the bug report

clang: Stop assuming one toolchain covers all GPUArchs (#190369)

[LV] Enable scalable FindLast on RISCV. (#184931)

This patch enables FindLast reduction vectorization with scalable vectors
on RISCV.

[DSE] Introduce `eliminateRedundantStoresViaDominatingConditions` (#181709)

While optimizing tautological assignments, if there exists a dominating
condition that implies the value being stored in a pointer, and such a
condition appears in a node that dominates the store via equality edge,
then subsequent stores may be redundant, if no write occurs in between.
This is achieved via a DFS top-down walk of the dom-tree, collecting
dominating conditions and propagating them to each subtree, popping them
upon backtracking.

This also generalizes `dominatingConditionImpliesValue` transform, which
was previously taking into account only the immediate dominator.

Compile-time:
https://llvm-compile-time-tracker.com/compare.php?from=f8906704104e446a7482aeca32d058b91867e05c&to=24c5d61f1e28acbe6a59ea4e9a5da0ffcee3bf1a&stat=instructions:u.

Compile-time w/ limit on recursion:
https://llvm-compile-time-tracker.com/compare.php?from=24c5d61f1e28acbe6a59ea4e9a5da0ffcee3bf1a&to=9889567fe8a0515ab895b22003c93fabfd9ac4e5&stat=instructions:u.
Seems to alleviate the small regression in stage2-O3, but seemingly adds
one in stage2-O0-g.

[DSE] Introduce tests for PR181709 (NFC) (#190454)

[AMDGPU] Enable real true16 on gfx1250

[AMDGPU] Update vop3-literal.s to use fake16 on gfx1250. NFC

16-bit instructions there are in fake16 mode and shall also be
compatible with older targets. The purpose of the test is to
check literals, so fake16 or real16 is not important.

[clang][test] Fix solaris ld driver test to not assume gnu ld location (#186250)

[LV] Add additional tests with IV live-outs. (NFC) (#190395)

Add additional tests with IV live-out users, for which epilogue
vectorization is not enabled yet.

Also modernize check lines.

[AMDGPU] Specialize gfx1250 codegen tests for fake and real t16. NFC. (#190390)

This is preparation of turning on real true16, so we can easily
apply it or revert.

[dsymutil] Add support for pseudo probes (#186877)

This patch teaches dsymutil to transfer the `__PSEUDO_PROBE` segment and
`__probes` and `__probe_descs` section when creating dSYMs. Without this, both probe sections will get an invalid offset in the dsym bundle.

[MLIR][Presburger] Fix stale pivot in Smith normal form (#189789)

The pivot used to fix divisibility in Smith normal form is stale. This
will not affect correctness, but can lower efficiency since the outer
loop will be executed more times.

Thanks for @benquike of discovering this.

[LFI][MC] Call setLFIRewriter during LFIMCStreamer initialization (#188625)

Calls `Streamer.setLFIRewriter` during generic LFIMCStreamer
initialization rather than requiring it to be done during
backend-specific initialization. This better follows the existing
conventions in `create*` functions in `TargetRegistry.h`.

Also re-adds the call to initSections for LFI in `llvm-mc.cpp`
(necessary in order to emit the ABI Note section), along with a test to
make sure ABI note emission with the rewriter is working.

Revert "[clang] Fix conflicting declaration error with using_if_exists" (#190441)

Reverts llvm/llvm-project#167646

[clang-doc] Fix file header style

Since we're fixing headers, we can also improve the file documentation
to follow the llvm coding standard.

[RISCV] Select add(vec, splat(scalar)) to PADD_*S for P extension (#190303)

[MLIR][XeGPU] Port tests from the XeGPUSubgroupDistribute to XeGPUSgToWiDistributeExperimental (#189747)

This PR ports tests from subgroup-distribute.mlir (old pass) to
sg-to-wi-experimental.mlir (new pass)

Address review comments

Created using spr 1.3.6-beta.1

[𝘀𝗽𝗿] changes introduced through rebase

Created using spr 1.3.6-beta.1

[skip ci]

[MLIR][XeGPU] Remove verifyLayouts from sg to wi pass (#190360)

The verifyLayouts function walked the IR before distribution and failed
the pass if any XeGPU anchor op or vector-typed result was missing a
layout attribute. This was added as a temporary guard while the pass was
being developed.
Now we add target check for each op.

[MLIR][XeGPU] Add support for reducing to scalar in sg to wi pass (#190193)

[lldb] Update dsym-python-script.test for #190407 (#190432)

[flang][cuda] Do not flag dummy arg component as host array (#190431)

[clang-doc] Use distinct APIs for fixed arena allocation sites

Typically, code either always emits data into the TransientArena or the
PersistentArena. Use more explicit APIs to convey the intent directly
instead of relying on parameters or defaults.

[clang-doc][nfc] Reformat and revise comment block

[clang-doc] Update type aliases

Many of the type aliases we introduced to simplify migration to arena
allocation  are no longer relevant after completing the migration. We
can use more relevant names and remove dead aliases.

[clang-doc] Removed OwnedPtr alias

The alias served a purpose during migration, but now conveys the wrong
semantics, as the memory of these pointers is generally interned inside
a local arena.