RewriteModernObjC.cpp: Don't expose temporary std::string with StringRef. (StringRef)getName() can be used here.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@153156 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Rewrite/RewriteModernObjC.cpp b/lib/Rewrite/RewriteModernObjC.cpp
index 101d35e..d8171e6 100644
--- a/lib/Rewrite/RewriteModernObjC.cpp
+++ b/lib/Rewrite/RewriteModernObjC.cpp
@@ -5736,7 +5736,7 @@
                              ArrayRef<ObjCProtocolDecl *> RefedProtocols,
                              ArrayRef<ObjCPropertyDecl *> ClassProperties) {
   
-  StringRef ClassName = ClassDecl->getNameAsString();
+  StringRef ClassName = ClassDecl->getName();
   // must declare an extern class object in case this class is not implemented 
   // in this TU.
   Result += "\n";