Use heterogenous lookup for std;:map<std::string with a StringRef. NFCI.
diff --git a/llvm/lib/DebugInfo/Symbolize/Symbolize.cpp b/llvm/lib/DebugInfo/Symbolize/Symbolize.cpp
index d0948fd..84cf4d4 100644
--- a/llvm/lib/DebugInfo/Symbolize/Symbolize.cpp
+++ b/llvm/lib/DebugInfo/Symbolize/Symbolize.cpp
@@ -62,7 +62,7 @@
 LLVMSymbolizer::symbolizeCode(const ObjectFile &Obj,
                               object::SectionedAddress ModuleOffset) {
   StringRef ModuleName = Obj.getFileName();
-  auto I = Modules.find(std::string(ModuleName));
+  auto I = Modules.find(ModuleName);
   if (I != Modules.end())
     return symbolizeCodeCommon(I->second.get(), ModuleOffset);