Duncan P. N. Exon Smith 170c26d75e MapMetadata: Allow unresolved metadata if it won't change ...

Allow unresolved nodes through the `MapMetadata()` if
`RF_NoModuleLevelChanges`, since there's no remapping to do anyway.

This fixes PR22929.  I'll add a clang test as a follow-up.

llvm-svn: 232449

2015-03-17 01:14:40 +00:00

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