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

src/compiler/js-intrinsic-lowering.cc

Index: src/compiler/js-intrinsic-lowering.cc
diff --git a/src/compiler/js-intrinsic-lowering.cc b/src/compiler/js-intrinsic-lowering.cc
index 7738e3a031d0aa31e8d0d73ae986875cee21beb2..7cf61a18aa67d7a10d79fe46a0d41253fb28f3b5 100644
--- a/src/compiler/js-intrinsic-lowering.cc
+++ b/src/compiler/js-intrinsic-lowering.cc
@@ -111,6 +111,8 @@ Reduction JSIntrinsicLowering::Reduce(Node* node) {
       return ReduceCall(node);
     case Runtime::kInlineTailCall:
       return ReduceTailCall(node);
+    case Runtime::kInlineGetSuperConstructor:
+      return ReduceGetSuperConstructor(node);
     default:
       break;
   }
@@ -614,6 +616,18 @@ Reduction JSIntrinsicLowering::ReduceTailCall(Node* node) {
 }
 
 
+Reduction JSIntrinsicLowering::ReduceGetSuperConstructor(Node* node) {
+  Node* active_function = NodeProperties::GetValueInput(node, 0);
+  Node* effect = NodeProperties::GetEffectInput(node);
+  Node* control = NodeProperties::GetControlInput(node);
+  Node* active_function_map = effect =
+      graph()->NewNode(simplified()->LoadField(AccessBuilder::ForMap()),
+                       active_function, effect, control);
+  return Change(node, simplified()->LoadField(AccessBuilder::ForMapPrototype()),
+                active_function_map, effect, control);
+}
+
+
 Reduction JSIntrinsicLowering::Change(Node* node, const Operator* op, Node* a,
                                       Node* b) {
   RelaxControls(node);