[PATCH] D122605: [Statepoint] Treat undef operands less specially

[Matt Arsenault via Phabricator via llvm-commits]

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This reverts commit f7443905af1e06eaacda1e437fff8d54dc89c487 <https://reviews.llvm.org/rGf7443905af1e06eaacda1e437fff8d54dc89c487>.

      

Rather than trying to treat undef operands as special, leave them
alone and avoid producing an invalid spill. It would a bit more
precise to produce a spill of an undef register here, but that's not
exposed through the storeRegToStackSlot API.


https://reviews.llvm.org/D122605

Files:
  llvm/lib/CodeGen/FixupStatepointCallerSaved.cpp
  llvm/lib/CodeGen/StackMaps.cpp
  llvm/test/CodeGen/X86/stackmap-undef-operand-anyregcc.mir
  llvm/test/CodeGen/X86/statepoint-fixup-undef.mir

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