Duncan P. N. Exon Smith 3c406c2da5 IR: Use SmallVector instead of std::vector of TrackingMDRef ...

Don't use std::vector<TrackingMDRef>, since (at least in some versions
of libc++) std::vector apparently copies values on grow operations
instead of moving them.  Found this when I was temporarily deleting the
copy constructor for TrackingMDRef to investigate a performance
bottleneck.

llvm-svn: 266909

2016-04-20 20:14:09 +00:00

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