Fix Name Access

Get the Record name by string explicitly to avoid potential asserts.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@142514 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/TableGen/TGParser.cpp b/lib/TableGen/TGParser.cpp
index e913bce..5dc25e9 100644
--- a/lib/TableGen/TGParser.cpp
+++ b/lib/TableGen/TGParser.cpp
@@ -1686,7 +1686,8 @@
 
     // Ensure redefinition doesn't happen.
     if (Records.getDef(CurRec->getName())) {
-      Error(DefLoc, "def '" + CurRec->getName() + "' already defined");
+      Error(DefLoc, "def '" + CurRec->getNameInitAsString()
+            + "' already defined");
       return true;
     }
     Records.addDef(CurRec);