[PATCH] D76339: [GlobalISel] Port some basic undef combines from DAGCombiner.cpp

[Jessica Paquette via Phabricator via llvm-commits]

paquette updated this revision to Diff 251132.
paquette added a comment.

Move combines to `all_combines` and remove extra cruft from testcase before committing.


CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D76339/new/

https://reviews.llvm.org/D76339

Files:
  llvm/include/llvm/CodeGen/GlobalISel/CombinerHelper.h
  llvm/include/llvm/Target/GlobalISel/Combine.td
  llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp
  llvm/test/CodeGen/AArch64/GlobalISel/arm64-fallback.ll
  llvm/test/CodeGen/AArch64/GlobalISel/prelegalizercombiner-undef.mir

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