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[NFC] Remove deprecated Argument::getParamAlignment() declaration (#169911)

The implementation of Argument::getParamAlignment() was removed in
commit b55f83d013eff244f7cf6bfcd06f06f7c894ff28, but the declaration in
Argument.h was left behind. Remove it.

NFC.

[NFC][lldb] document Process::SetSTDIOFileDescriptor (#169849)

[libc][darwin] add internal::exit (#166357)

Add internal::exit for MacOS/Darwin

[libc][test] split exit tests into two separate tests (#169820)

_Exit(3) is a fairly simple syscall wrapper whereas exit(3) calls
atexit-registered functions + whole lot of stuff that require support
for sync primitives.

Splitting the tests allows testing the former easily (especially for new
port projects)

---------

Signed-off-by: Shreeyash Pandey <shreeyash335 at gmail.com>

[flang][OpenMP] Add lowering of subroutine calls in custom reduction combiners (#169808)

This patch adds support for lowering subroutine calls in custom
reduction combiners to MLIR.

[LLDB][PDB] Access object file through module (#169728)

When a PDB is loaded through `target symbols add <pdb-path>`, its
`m_objectfile_sp` is an `ObjectFilePDB` instead of `ObjectFilePECOFF`
(the debugged module). In both the native and DIA plugin, some paths
assumed that `m_objectfile_sp` is the debugged module. With this PR,
they go through `m_objfile_sp->GetModule()->GetObjectFile()`.

For the DIA plugin, this lead to an assertion failure
(https://github.com/llvm/llvm-project/issues/169628#issuecomment-3582555277)
and for both plugins, it meant that the symbol table wasn't loaded.

CMake-ify

[MLIR] Apply clang-tidy fixes for readability-avoid-const-params-in-decls in MPIToLLVM.cpp (NFC)

[MLIR] Apply clang-tidy fixes for llvm-else-after-return in SelectObjectAttr.cpp (NFC)

AMDGPU/GlobalISel: Report RegBankLegalize errors using reportGISelFailure

Use standard GlobalISel error reporting with reportGISelFailure
and pass returning false instead of llvm_unreachable.
Also enables -global-isel-abort=0 or 2 for -global-isel -new-reg-bank-select.
Note: new-reg-bank-select with abort 0 or 2 runs LCSSA,
while "intended use" without abort or with abort 1 does not run LCSSA.

[Headers][X86] Convert bf16 to f32 conversions to constexpr implementations (#169841)

Fixes #154911

[MLIR][NVVM] Add Permute Op (#169793)

This patch adds the `permute` op.
Lit tests are added to verify the lowering to the intrinsics. 
Negative tests are also added to check the error-handling of invalid
combinations.

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

Signed-off-by: Dharuni R Acharya <dharunira at nvidia.com>

Also move omp_lib.h

GlobalISel: Stop using TPC to check if GlobalISelAbort is enabled

New pass manager does not use TargetPassConfig.
GlobalISel requires TargetPassConfig to reportGISelFailure,
and it only actual use is to check if GlobalISelAbort is enabled.
TargetPassConfig uses TargetMachine to check if GlobalISelAbort is
enabled, but TargetMachine is also available from MachineFunction.

Allow non-LIBOMP_FORTRAN_MODULES mode

[TySan] Make TySan compatible with UBSan (#169036)

[AArch64] Fix metrics of ASIMD instructions in Neoverse N3 (#169790)

Some ASIMD instructions in the Neoverse N3 scheduler model seem to have
been missed and have default definitions, which give them incorrect
latency and throughput. This patch fixes such instructions to match the
current N3 SWOG.

[BOLT] PointerAuthCFIAnalyzer: return early if there is no work

- makes sure we do not divide by zero, to calculate the % of ignored
  functions.

[BOLT] Add comment about the chosen threshold

[BOLT] Use opts::Verbosity in PointerAuthCFIAnalyzer

[BOLT][PAC] Warn about synchronous unwind tables

BOLT currently ignores functions with synchronous PAuth DWARF info.
When more than 10% of functions get ignored for inconsistencies, we
should emit a warning to only use asynchronous unwind tables.

See also: #165215

[BOLT][doc] Add two resolutions for CFI

[BOLT][NFC] Rename Pointer Auth DWARF rewriter passes

Original names were "working titles". After initial patches are merged,
I'd like to rename these passes to names that reflect their intent
better and show their relationship to each other:

InsertNegateRAStatePass renamed to PointerAuthCFIFixup,
MarkRAStates renamed to PointerAuthCFIAnalyzer.

[BOLT] Add --print flags for PointerAuthCFI* passes

Update PacRetDesign.md

Update bolt/docs/PacRetDesign.md

Co-authored-by: Paschalis Mpeis <paschalis.mpeis at arm.com>

[NFC] Rename PAuth tests to have a common prefix

Fix for cases where empty BBs are preceding unknown BBs

also added regression test for this.

[lldb] Fix duplicate test class name causing lldb-dotest conflict (#169861)

Duplicate test class name `TestFrameVarDILPointerArithmetic` prevents
lldb-dotest from running any tests.
The conflict exists between:
- lldb/test/API/commands/frame/vardil/expr/PointerArithmetic/
- lldb/test/API/commands/frame/vardil/basics/PointerArithmetic/

Rename the expr variant to `TestFrameVarDILExprPointerArithmetic`.