Don't create a whole new string just to copy the elements into it.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52785 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/CodeGen/MachineModuleInfo.cpp b/lib/CodeGen/MachineModuleInfo.cpp
index 1720745e4459fede06d5fbbd7a370ad2b9e71419..60526643fdfc68c4cfbf8febef734ed46cf3e20e 100644 (file)
--- a/lib/CodeGen/MachineModuleInfo.cpp
+++ b/lib/CodeGen/MachineModuleInfo.cpp
@@ -231,11 +231,9 @@ public:
   }
   virtual void Apply(std::string &Field) {
     Constant *C = CI->getOperand(I++);
-    std::string S;
-    if (GetConstantStringInfo(C, S))
-      Field = S;
-    else
-      Field = "";
+    // Fills in the string if it succeeds
+    if (!GetConstantStringInfo(C, Field))
+      Field.clear();
   }
   virtual void Apply(DebugInfoDesc *&Field) {
     Constant *C = CI->getOperand(I++);