[es6] Don't use the %GetPrototype runtime entry for super calls.

src/compiler/js-intrinsic-lowering.h

Index: src/compiler/js-intrinsic-lowering.h
diff --git a/src/compiler/js-intrinsic-lowering.h b/src/compiler/js-intrinsic-lowering.h
index 5bcc526fdc2ca903727b331574943a254e8cab76..b0dfe56ee77f4eb226631b4008a9963db3d856e3 100644
--- a/src/compiler/js-intrinsic-lowering.h
+++ b/src/compiler/js-intrinsic-lowering.h
@@ -72,6 +72,7 @@ class JSIntrinsicLowering final : public AdvancedReducer {
   Reduction ReduceToString(Node* node);
   Reduction ReduceCall(Node* node);
   Reduction ReduceTailCall(Node* node);
+  Reduction ReduceGetSuperConstructor(Node* node);
 
   Reduction Change(Node* node, const Operator* op);
   Reduction Change(Node* node, const Operator* op, Node* a, Node* b);