Unweaken vtables as per http://llvm.org/docs/CodingStandards.html#ll_virtual_anch

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@146960 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/utils/TableGen/SetTheory.cpp b/utils/TableGen/SetTheory.cpp
index bef73f3..838b924 100644
--- a/utils/TableGen/SetTheory.cpp
+++ b/utils/TableGen/SetTheory.cpp
@@ -198,6 +198,10 @@
 };
 } // end anonymous namespace
 
+void SetTheory::Operator::anchor() { }
+
+void SetTheory::Expander::anchor() { }
+
 SetTheory::SetTheory() {
   addOperator("add", new AddOp);
   addOperator("sub", new SubOp);