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Summary: When RF_NullMapMissingGlobalValues is set, mapValue can return null for GlobalValue. When mapping the operands of a constant that is referenced from metadata, we need to handle this case and actually return null instead of mapping this constant. Reviewers: dexonsmith, rafael Subscribers: llvm-commits Differential Revision: http://reviews.llvm.org/D20713 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@271129 91177308-0d34-0410-b5e6-96231b3b80d8