llvm/unittests
Mehdi Amini 256567583d Query the StringMap only once when creating MDString (NFC)
Summary:
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.

Reviewers: dexonsmith

Subscribers: llvm-commits

Differential Revision: http://reviews.llvm.org/D17920

From: Mehdi Amini <mehdi.amini@apple.com>

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@264386 91177308-0d34-0410-b5e6-96231b3b80d8
2016-03-25 05:58:04 +00:00
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