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[MLIR][NVVM] Add missing rounding modes in fp16x2 conversions (#169005)

This change adds the `RN` and `RZ` rounding modes to the
`convert.f32x2.to.f16x2` and `convert.f32x2.to.bf16x2` Ops.

Tests are added in `convert_fp16x2.mlir` and
`invalid_convert_fp16x2.mlir`.
Tests with these Ops in `convert_stochastic_rounding.mlir` and
`invalid-convert-stochastic-rounding.mlir` have been removed or
modified.

PTX spec reference:
https://docs.nvidia.com/cuda/parallel-thread-execution/#data-movement-and-conversion-instructions-cvt

[ReplaceConstant] Don't create instructions for the same constant multiple times in the same basic block (#169141)

Fixes #167500.

fix windows

Created using spr 1.3.7

update tests

Add missing freeConstants() call for ConstantPtrAuths.

Fixes memory leak uncovered by #133533.

[LoongArch] Legalize BUILD_VECTOR into a broadcast when all non-undef elements are identical

When a BUILD_VECTOR consists of the same element (ignoring undefs),
it is better emitting a broadcast instead of multiple insertions.

Some floating-point cases suffer performance regressions, those
specific cases are excluded in this commit. Including when:

- only one element is non-undef,
- only two elements are non-undef, and one of them must at index 0,
- for v8f32 vector type, specially exclude the cases when the only
two non-undefs are at index (1,2)/(1,3)/(2,3).

[LoongArch][NFC] Add tests for build_vector containing same elements except for undefs

[lldb-dap] Add breakpoints after debugger initialization in DExTer (#169744)

# Summary
This is a forward fix for test errors from
https://github.com/llvm/llvm-project/pull/163653.

The PR moved debugger initialization outside of
InitializeRequestHandler, and into Launch/AttachRequestHandlers to
support DAP sessions sharing debugger instances for dynamically created
targets. However, DExTer's DAP class seemed to set breakpoints before
the debugger was initialized, which caused the tests to hang waiting for
a breakpoint to hit due to none of the breakpoints getting resolved.

# Tests
```
bin/llvm-lit -v /home/qxy11/llvm/llvm-project/cross-project-tests/debuginfo-tests/dexter-tests/
```

[libc++][mdspan] Applied `[[nodiscard]]` (#169326)

`[[nodiscard]]` should be applied to functions where discarding the
return value is most likely a correctness issue.
-
https://libcxx.llvm.org/CodingGuidelines.html#apply-nodiscard-where-relevant

[mlir][Transforms] Dialect conversion: Add support for `replaceUsesWithIf` (#169606)

This commit adds support for `replaceUsesWithIf` (and variants such as
`replaceAllUsesExcept`) to the `ConversionPatternRewriter`. This API is
supported only in no-rollback mode. An assertion is triggered in
rollback mode. (This missing assertion has been confusing for users
because it seemed that the API supported, while it was actually not
working properly.)

This commit brings us a bit closer towards removing
[this](https://github.com/llvm/llvm-project/blob/76ec25f729fcc7ae576caf21293cc393e68e7cf7/mlir/lib/Transforms/Utils/DialectConversion.cpp#L1214)
workaround.

Additional changes are needed to support this API in rollback mode. In
particular, no entries should be added to the `ConversionValueMapping`
for conditional replacements. It's unclear at this point if this API can
be supported in rollback mode, so this is deferred to later.

This commit turns `replaceUsesWithIf` into a virtual function, so that

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[flang] Use default constructor for FIRToSCF pass (#169741)

[libc++][queue] Applied `[[nodiscard]]` (#169469)

`[[nodiscard]]` should be applied to functions where discarding the
return value is most likely a correctness issue.

-
https://libcxx.llvm.org/CodingGuidelines.html#apply-nodiscard-where-relevant

address comments

[LoadStoreVectorizer] Fix one-element vector handling (#169671)

This is the followup of https://github.com/llvm/llvm-project/pull/168135

[mlir][dataflow] Add arguemnt print for test-liveness-analysis (#169625)

Add arguemnt print for test-liveness-analysis to better debug
remove-dead-values pass.

---------

Co-authored-by: Mehdi Amini <joker.eph at gmail.com>

[AMDGPU] Remove unused functions isSigned. NFC (#169750)

These have been unused since
https://github.com/llvm/llvm-project/pull/145483.

[UBSan] Use -fsanitize-handler-preserve-all-regs in codegen



Pull Request: https://github.com/llvm/llvm-project/pull/168645

address review get() -> native_handle() and constexpr invalid value

Created using spr 1.3.7

[UBSan] Use -fsanitize-handler-preserve-all-regs in codegen (#168645)

[mlir][arith] Add support for `cmpf` to `ArithToAPFloat`
x

[lldb] Use InlHostByteOrder in RegisterValue::SetValueFromData (#169624)

An existing code can be further simplified.

---------

Co-authored-by: Matej Košík <matej.kosik at codasip.com>

[ORC] Clear stale ElemToPendingSN entries in WaitingOnGraph. (#169747)

WaitingOnGraph::processReadyOrFailed was not clearing stale entries from
the ElemToPendingSN map. If symbols were removed from the
ExecutionSession and then re-added this could lead to dependencies on
the stale entries, triggering a use-after-free bug.

https://github.com/llvm/llvm-project/issues/169135

simplify: Avoid calling getTileShape(Result&Operand) from getTileShape(op)

[llvm-objdump] Optimize live element tracking (#158763)

This patch significantly optimizes the LiveElementPrinter
by replacing a slow linear search with efficient hash map
lookups. It refactors the code to use a map-based system
for tracking live element addresses and managing column
assignments, leading to a major performance improvement
for large binaries.

Unsupport SW encoding

Created using spr 1.3.6-beta.1

simplify: load_nd/store_nd/prefetch_nd use anchor layout for blocking

[𝘀𝗽𝗿] initial version

Created using spr 1.3.7

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]

simplify: load/store/prefetch/loadmatrix/storematrix use anchor layout for blocking