Duncan P. N. Exon Smith 03e0583a2d IR: Move MDNode clone() methods from ValueMapper to MDNode, NFC ...

Now that the clone methods used by `MapMetadata()` don't do any
remapping (and return a temporary), they make more sense as member
functions on `MDNode` (and subclasses).

llvm-svn: 226541

2015-01-20 02:56:57 +00:00

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