[PATCH] D17920: Query the StringMap only once when creating MDString (NFC)

[Mehdi AMINI via llvm-commits]

joker.eph updated this revision to Diff 51314.
joker.eph added a comment.

Add a test for emplace_second


http://reviews.llvm.org/D17920

Files:
  include/llvm/ADT/StringMap.h
  include/llvm/IR/Metadata.h
  lib/IR/Metadata.cpp
  unittests/ADT/StringMapTest.cpp

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