[all-commits] [llvm/llvm-project] 53fef0: [NFCI][SimplifyCFG] simplifyUnreachable(): Use poi...

[Roman Lebedev via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 53fef0b2933a120b2ee876127c574002f8eb8c14
      https://github.com/llvm/llvm-project/commit/53fef0b2933a120b2ee876127c574002f8eb8c14
  Author: Roman Lebedev <lebedev.ri at gmail.com>
  Date:   2021-07-02 (Fri, 02 Jul 2021)

  Changed paths:
    M llvm/lib/Transforms/Utils/SimplifyCFG.cpp

  Log Message:
  -----------
  [NFCI][SimplifyCFG] simplifyUnreachable(): Use poison constant to represent the result of unreachable instrs

Mimics similar change for InstCombine:
  ce192ced2b901be67444c481ab5ca0d731e6d982 / D104602

All these uses are in blocks that aren't reachable from function's entry,
and said blocks are removed by SimplifyCFG itself,
so we can't really test this change.