[PATCH] D70597: [PHIEliminate] skip dbg instruction when LowerPHINode

[Chris Ye via Phabricator via llvm-commits]

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update description in test case


Debug instruction should not impact PHI node lower when PHI node is at the top of the specified block.
Fix issue: https://bugs.llvm.org/show_bug.cgi?id=43859


https://reviews.llvm.org/D70597

Files:
  llvm/lib/CodeGen/PHIElimination.cpp
  llvm/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp.bk
  llvm/test/CodeGen/X86/phi-node-elimination-dbg-invariant.mir

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