Recognize $foo as a variable


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@7712 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/utils/TableGen/FileParser.y b/utils/TableGen/FileParser.y
index 0ab3e5b..5b983eb 100644
--- a/utils/TableGen/FileParser.y
+++ b/utils/TableGen/FileParser.y
@@ -171,7 +171,7 @@
 
 %token INT BIT STRING BITS LIST CODE DAG CLASS DEF FIELD LET IN
 %token <IntVal>      INTVAL
-%token <StrVal>      ID STRVAL CODEFRAGMENT
+%token <StrVal>      ID VARNAME STRVAL CODEFRAGMENT
 
 %type <Ty>           Type
 %type <Rec>          ClassInst DefInst Object ObjectBody ClassID