[PATCH] D27534: [BDCE] Skip metadata while replacing uses

[Davide Italiano via Phabricator via llvm-commits]

davide created this revision.
davide added a reviewer: hfinkel.
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The fix committed in r288851 doesn't cover all the cases. In particular, if we have an instruction with side effects which has a no non-dbg use not depending on the bits, we still perform RAUW destroying the dbg.value's first argument.
Prevent metadata from being replaced here to avoid the issue.


https://reviews.llvm.org/D27534

Files:
  include/llvm/IR/Value.h
  lib/IR/Value.cpp
  lib/Transforms/Scalar/BDCE.cpp
  test/Transforms/BDCE/dbg-multipleuses.ll

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