[PATCH] D33731: Prevent RemoveDeadNodes from deleted already deleted node.

[Nirav Dave via Phabricator via llvm-commits]

niravd created this revision.

This prevents against assertion errors like PR32659 which occur from a
replacement deleting a node after it's been added to the list argument
of RemoveDeadNodes.


https://reviews.llvm.org/D33731

Files:
  lib/CodeGen/SelectionDAG/SelectionDAG.cpp
  test/CodeGen/X86/pr32659.ll

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