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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. Differential Revision: https://reviews.llvm.org/D27534 llvm-svn: 288987
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