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If a method / function returns a StringRef but the variable is of type const std::string& a temporary string is created (StringRef has a cast operator to std::string), which is a suboptimal behavior. Differential revision: https://reviews.llvm.org/D34994 Test plan: make check-all git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@307195 91177308-0d34-0410-b5e6-96231b3b80d8