[PATCH] D48277: [DebugInfo] Keep DBG_VALUE undef in LiveDebugVariables

[Mikael Holmén via Phabricator via llvm-commits]

uabelho updated this revision to Diff 151898.
uabelho added a comment.

Added some comments about why undef values are not added to "locations".

Also added an isUndef() check in UserValue::rewriteLocations so we don't try to update the locNo
of undef locNo (which should always be the same, ~0).


https://reviews.llvm.org/D48277

Files:
  lib/CodeGen/LiveDebugVariables.cpp
  test/DebugInfo/X86/live-debug-vars-discard-invalid.mir
  test/DebugInfo/X86/live-debug-vars-keep-undef.ll

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