Use StringRef which performs the "early exit" when compared against a constant
string.

llvm-svn: 113615
diff --git a/llvm/lib/VMCore/AutoUpgrade.cpp b/llvm/lib/VMCore/AutoUpgrade.cpp
index 2eeb354..9330e14 100644
--- a/llvm/lib/VMCore/AutoUpgrade.cpp
+++ b/llvm/lib/VMCore/AutoUpgrade.cpp
@@ -366,12 +366,7 @@
 }
 
 bool llvm::UpgradeGlobalVariable(GlobalVariable *GV) {
-  const std::string &Name = GV->getName();
-
-  // Early exit with simple tests.
-  if (Name.length() != 24 || Name[0] != '.' || Name[1] != 'l' ||
-      Name[3] != 'l' || Name[4] != 'v' || Name[5] != 'm' || Name[6] != '.')
-    return false;
+  StringRef Name(GV->getName());
 
   // We are only upgrading one symbol here.
   if (Name == ".llvm.eh.catch.all.value") {