fix a nasty bug in CheckTypeMatcher::isEqualImpl


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@97216 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/utils/TableGen/DAGISelMatcher.h b/utils/TableGen/DAGISelMatcher.h
index df63895..b5c6e55 100644
--- a/utils/TableGen/DAGISelMatcher.h
+++ b/utils/TableGen/DAGISelMatcher.h
@@ -409,7 +409,7 @@
 private:
   virtual void printImpl(raw_ostream &OS, unsigned indent) const;
   virtual bool isEqualImpl(const Matcher *M) const {
-    return cast<CheckTypeMatcher>(this)->Type == Type;
+    return cast<CheckTypeMatcher>(M)->Type == Type;
   }
   virtual unsigned getHashImpl() const { return Type; }
 };