[PATCH] D88925: [X86] Fix bug in -mlvi-cfi that may clobber a live register

[Scott Constable via Phabricator via llvm-commits]

sconstab created this revision.
sconstab added a reviewer: craig.topper.
Herald added subscribers: pengfei, jfb, hiraditya.
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sconstab requested review of this revision.

Fix for this bug: https://bugs.llvm.org/show_bug.cgi?id=47740

The fix uses the existing `findDeadCallerSavedReg()` function instead of a hacky heuristic to find a scratch register to clobber.


https://reviews.llvm.org/D88925

Files:
  llvm/lib/Target/X86/X86LoadValueInjectionRetHardening.cpp
  llvm/test/CodeGen/X86/lvi-hardening-ret.ll

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