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RAUW of a global variable with a local variable in function F, if function local metadata M in function G was using the global then M would become function-local to both F and G, which is not allowed. See the testcase for an example. Fixed by detecting this situation and zapping the metadata operand when it occurs. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@103007 91177308-0d34-0410-b5e6-96231b3b80d8
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