[PATCH] D84964: [WIP] Demo a functional problem from D81647 with a fix and test case

[Philip Reames via Phabricator via llvm-commits]

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When spilling gc operands, we have to mark them as load and store.  They were originally defs and we need to preserve that.

This is semantically important as a relocating collector *will* update them sometimes.


https://reviews.llvm.org/D84964

Files:
  llvm/lib/CodeGen/FixupStatepointCallerSaved.cpp
  llvm/test/CodeGen/X86/statepoint-vreg-fixup-csr.ll

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