[PATCH] D43850: [CodeGen] Avoid handling DBG_VALUE instructions for stepBackwards

[Matt Davis via Phabricator via llvm-commits]

mattd updated this revision to Diff 137313.
mattd added a comment.

Thanks for the feedback, and my apologies for not providing additional context in the diff.  The updated patch:

- I added an 'isDebugValue' check to LivePhysRegs::stepForward,  I was hesitant to add this, as it never seemed problematic, but it doesn't seem wrong to add the check here either.
- I made the test a .mir test instead of .ll.  I tried to reduce this as much as possible.


https://reviews.llvm.org/D43850

Files:
  lib/CodeGen/LivePhysRegs.cpp
  test/CodeGen/X86/dbg-changes-codegen-branch-folding2.mir

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