[all-commits] [llvm/llvm-project] ea17d2: [llvm] Do not replace dead constant references in ...

[Stephen Tozer via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: ea17d29a6c834a34a698c87193a86eeab04922d2
      https://github.com/llvm/llvm-project/commit/ea17d29a6c834a34a698c87193a86eeab04922d2
  Author: Stephen Tozer <stephen.tozer at sony.com>
  Date:   2022-01-24 (Mon, 24 Jan 2022)

  Changed paths:
    M llvm/lib/IR/Constants.cpp
    A llvm/test/LTO/Resolution/X86/Inputs/no-undef-type-md.ll
    A llvm/test/LTO/Resolution/X86/no-undef-type-md.ll

  Log Message:
  -----------
  [llvm] Do not replace dead constant references in metadata with undef

This patch removes an incorrect behaviour in Constants.cpp, which would
replace dead constant references in metadata with an undef value. This
blanket replacement resulted in undef values being inserted into
metadata that would not accept them. The replacement was intended for
debug info metadata, but this is now instead handled in the RAUW
handler.

Differential Revision: https://reviews.llvm.org/D117300