Remove unnecessary StringRef->char*->StringRef conversion, which read uninitialized memory if the input wasn't 0-terminated.

Found by valgrind.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@155323 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Parse/ParseDeclCXX.cpp b/lib/Parse/ParseDeclCXX.cpp
index c391782..771388f 100644
--- a/lib/Parse/ParseDeclCXX.cpp
+++ b/lib/Parse/ParseDeclCXX.cpp
@@ -2847,7 +2847,7 @@
     StringRef Spelling = PP.getSpelling(Tok.getLocation(), SpellingBuf);
     if (std::isalpha(Spelling[0])) {
       Loc = ConsumeToken();
-      return &PP.getIdentifierTable().get(Spelling.data());
+      return &PP.getIdentifierTable().get(Spelling);
     }
     return 0;
   }