Progress:

Changes

[PowerPC] Fix gcc warning about unused variable [NFC]

gcc warned about
../lib/Target/PowerPC/PPCTargetTransformInfo.cpp:1401:13: warning: unused variable 'VecTy' [-Wunused-variable]
 1401 |   if (auto *VecTy = dyn_cast<FixedVectorType>(DataType)) {
      |             ^~~~~

[ARM] Fix gcc warning about mix of enumeral and non-enumeral types

gcc warned with
../lib/Target/ARM/ARMFrameLowering.cpp:797:31: warning: enumeral and non-enumeral type in conditional expression [-Wextra]
  797 |               Reg == ARM::R12 ? ARM::RA_AUTH_CODE : Reg, true);
      |               ~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

[Test] [GVN] Add test showing equivalent PHIs generation by GVN

[clang][deps] Use lock_guard instead of unique_lock

This patch changes uses of `std::unique_lock` to `std::lock_guard`.

The `std::unique_lock` template provides some advanced capabilities (deferred locking, time-constrained locking attempts, etc.) we don't use in the caching filesystem. Plain `std::lock_guard` will do here.

Reviewed By: dexonsmith

Differential Revision: https://reviews.llvm.org/D115332

[clang] Fix a misadjusted path style comparison in a unittest

This was changed incorrectly by accident in
99023627010bbfefb71e25a2b4d056de1cbd354e.

Differential Revision: https://reviews.llvm.org/D113254

[MLIR][OpenMP] Added omp.atomic.update

This patch supports the atomic construct (update) following section 2.17.7 of OpenMP 5.0 standard. Also added tests and verifier for the same.

Reviewed By: kiranchandramohan, peixin

Differential Revision: https://reviews.llvm.org/D112982

[MLIR] Introduce coalesce for PresburgerSet

This patch provides functionality for simplifying `PresburgerSet`s by checking if any `FlatAffineConstraints` in the set is contained in another, and removing such redundant FACs.

This is part of a series of patches to provide functionality for [integer set coalescing](http://impact.gforge.inria.fr/impact2015/papers/impact2015-verdoolaege.pdf) in MLIR.

Reviewed By: arjunp

Differential Revision: https://reviews.llvm.org/D110617