[all-commits] [llvm/llvm-project] 6aac30: Update FEAT_PAuth_LR behaviour for AArch64 (#90614)

[Jack Styles via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 6aac30fa43f094ac25269bda163dc89a88cb8da7
      https://github.com/llvm/llvm-project/commit/6aac30fa43f094ac25269bda163dc89a88cb8da7
  Author: Jack Styles <jack.styles at arm.com>
  Date:   2024-05-10 (Fri, 10 May 2024)

  Changed paths:
    M clang/lib/Basic/Targets/AArch64.cpp
    M clang/lib/Driver/ToolChains/Clang.cpp
    M clang/test/Preprocessor/aarch64-target-features.c
    M llvm/docs/ReleaseNotes.rst
    M llvm/include/llvm/TargetParser/AArch64TargetParser.h
    M llvm/include/llvm/TargetParser/ARMTargetParserCommon.h
    M llvm/lib/TargetParser/AArch64TargetParser.cpp
    M llvm/lib/TargetParser/ARMTargetParserCommon.cpp

  Log Message:
  -----------
  Update FEAT_PAuth_LR behaviour for AArch64 (#90614)

Currently, LLVM enables `-mbranch-protection=standard` as `bti+pac-ret`.
To align LLVM with the behaviour in GNU, this has been updated to
`bti+pac-ret+pc` when FEAT_PAuth_LR is enabled as an optional feature
via the `-mcpu=` options. If this is not enabled, then this will revert
to the existing behaviour.



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