Eric Fiselier 500886841d Teach map/unordered_map how to optimize 'emplace(Key, T)'. ...

In cases where emplace is called with two arguments and the first one
matches the key_type we can Key to check for duplicates before allocating.

This patch expands on work done by dexonsmith@apple.com.

llvm-svn: 266498

2016-04-16 00:23:12 +00:00

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