StringRefify.

llvm-svn: 127082
diff --git a/clang/lib/CodeGen/CodeGenModule.h b/clang/lib/CodeGen/CodeGenModule.h
index 73e6ece..4a1575a 100644
--- a/clang/lib/CodeGen/CodeGenModule.h
+++ b/clang/lib/CodeGen/CodeGenModule.h
@@ -437,7 +437,7 @@
   ///
   /// \param GlobalName If provided, the name to use for the global
   /// (if one is created).
-  llvm::Constant *GetAddrOfConstantString(const std::string& str,
+  llvm::Constant *GetAddrOfConstantString(llvm::StringRef Str,
                                           const char *GlobalName=0);
 
   /// GetAddrOfConstantCString - Returns a pointer to a character array