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Commit a4810fac authored by Duncan P. N. Exon Smith's avatar Duncan P. N. Exon Smith
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Linker: Avoid constructing ValueMap::MDMapT 

Calling ValueMap::MD lazily constructs a ValueMap, which mallocs the
buckets.  Instead of swapping constructed maps, move around the
underlying Optional<MDMapT>.  This gets rid of some unnecessary malloc
traffic from r266579 (not that it showed up on a profile).

llvm-svn: 266761
parent a1202bf5
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