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[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

github-upload-release.py: add requirements and lock files for installing dependencies (#169461)

Adds requirements.txt and lock files for installing dependencies for
github-upload-release.py script.

Signed-off-by: Ryan Mast <mast.ryan at gmail.com>

[lld][MachO] Follow-up to use madvise() for threaded file page-in. (#157917)

Further to
https://github.com/llvm/llvm-project/pull/147134#discussion_r2337246489,
switch to use the madvise() api to page in mmap'd files and

1) All new code compiled in #if LLVM_ENABLE_THREADS is set so it can be
seen where the changes were from this PR.
2) The new PR moves to use madvise() instead of the ad-hoc page
referencing code I wrote which should avoid SIGSEGVs if the buffer is
deallocated.
3) A new property SerialBackgroundQueue().stopAllWork to be used to stop
background workers when there is no further call for them. Usually the
background "page-in" threads have completed first but it seems with this
troublesome test this is not always the case and buffers stored in the
static input file cache are being deallocated while being referenced.

---------

Co-authored-by: James Henderson <James.Henderson at sony.com>

[CIR][NFC] Move builtin tests to their own directory (#169737)

This moves all builtin-related CodeGen tests to a new directory,
separate from the main clang/test/CIR/CodeGen directory. This will make
it easier to run the basic CodeGen tests without running the builtin
tests. This is specifically intended to move those tests which include
`immintrin.h` or any of its variants, which take a very long time to
compile with a debug build.

Revert "[lldb-dap] Add multi-session support with shared debugger instances (…"

This reverts commit 5ab3375b2cf461ab02704d129a1f4d5ba1a1e275.

Fix sanitizer failure introduced by #133537

[CIR] Add undef handling to enable global lambdas (#169721)

This change adds undef handling that was needed to enable global
lambdas. There was no lambda-specific code needed, but the global lambda
handling needed to initialize a global with an undef value.

[CIR] Handle undef init of struct

This adds handling for a case where Clang initializes a struct to undef
with a constant copy. This required adding support for undef constants
and lowering undef attributes to LLVM IR.