Drop a RecordKeeper reference that wasn't necessary.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@132636 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/utils/TableGen/SetTheory.h b/utils/TableGen/SetTheory.h
index 2202f22..e37a76e 100644
--- a/utils/TableGen/SetTheory.h
+++ b/utils/TableGen/SetTheory.h
@@ -96,8 +96,7 @@
 
 public:
   /// Create a SetTheory instance with only the standard operators.
-  /// A 'sequence' operator will only be added if a RecordKeeper is given.
-  SetTheory(RecordKeeper *Records = 0);
+  SetTheory();
 
   /// addExpander - Add an expander for Records with the named super class.
   void addExpander(StringRef ClassName, Expander*);