tblgen: Factor out common code.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@171951 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/TableGen/TGParser.h b/lib/TableGen/TGParser.h
index 70fc9df..215cbfc 100644
--- a/lib/TableGen/TGParser.h
+++ b/lib/TableGen/TGParser.h
@@ -183,6 +183,7 @@
   Init *ParseObjectName(MultiClass *CurMultiClass);
   Record *ParseClassID();
   MultiClass *ParseMultiClassID();
+  bool ApplyLetStack(Record *CurRec);
 };
 
 } // end namespace llvm