Implement !cast.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@71794 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/utils/TableGen/TGLexer.h b/utils/TableGen/TGLexer.h
index 0f27308..b95ca95 100644
--- a/utils/TableGen/TGLexer.h
+++ b/utils/TableGen/TGLexer.h
@@ -45,7 +45,7 @@
     MultiClass, String,
     
     // !keywords.
-    XConcat, XSRA, XSRL, XSHL, XStrConcat, XNameConcat, //XSubst, XCast,
+    XConcat, XSRA, XSRL, XSHL, XStrConcat, XNameConcat, XCast, // XSubst,
     //XForEach,
 
     // Integer value.