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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