Fix Name Access

Get the Record name as a string explicitly to avoid asserts.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@142516 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/TableGen/TGParser.cpp b/lib/TableGen/TGParser.cpp
index 1e5b55f..b06b8db 100644
--- a/lib/TableGen/TGParser.cpp
+++ b/lib/TableGen/TGParser.cpp
@@ -1747,7 +1747,8 @@
     if (!CurRec->getValues().empty() ||
         !CurRec->getSuperClasses().empty() ||
         !CurRec->getTemplateArgs().empty())
-      return TokError("Class '" + CurRec->getName() + "' already defined");
+      return TokError("Class '" + CurRec->getNameInitAsString()
+                      + "' already defined");
   } else {
     // If this is the first reference to this class, create and add it.
     CurRec = new Record(Lex.getCurStrVal(), Lex.getLoc(), Records);