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

[Mehdi AMINI via llvm-commits]

joker.eph created this revision.
joker.eph added a reviewer: dexonsmith.
joker.eph added a subscriber: llvm-commits.

Loading IR with debug info improves MDString::get() from 19ms to 10ms.
This is a rework of D16597 with adding an "emplace" method on the StringMap
to avoid requiring the MDString move ctor to be public.

http://reviews.llvm.org/D17920

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

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