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[libc++] Reformat `optional` constructor tests (#169231)

- Mass-reformat tests in
`std/utilities/optional/optional.object/optional.object.ctor` and
rearrange header `#include`s
- No functional changes
- Prelude for #169203

Multi-origin changes

Merge branch 'main' into users/ylzsx/precommit-rotr-custom

[clang][bytecode] Remove double diagnostic emission (#169658)

We emit this diagnostic from CheckPointerToIntegralCast() already, so
remove the emission from CastPointerIntegral().

[mlir][LLVMIR] Handle missing functions in CGProfile module flags (#169517)

This commit extends the CGProfile module flags export with support for missing function references. Previously, this caused a crash and now it's properly exported to `null` values in the metadata node.
Fixes: https://github.com/llvm/llvm-project/issues/160717

fix windows build

Created using spr 1.3.7

[clang][Tooling] Fix `getFileRange` returning a range spanning across macro arguments (#169757)

When the start and end token are both spelled in macro arguments, we
still want to reject the range if they come from two separate macro
arguments, as the original specified range is not precisely spelled in a
single sequence of characters in source.

[mlir][arith] Add support for min/max to `ArithToAPFloat`

[MLIR][Intrinsics] Add new MLIR API to automatically resolve overload types (#168188)

Add createIntrinsicCall overload that accepts return type and arguments,
automatically resolve overload types rather than requiring manual
computation. Simplifies NVVM_PrefetchOp by removing conditional overload
logic.

[mlir][arith] Add support for `negf` to `ArithToAPFloat`

[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`
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