new classes: implement new.target passing to superclass constructor.

src/compiler/js-generic-lowering.cc

Index: src/compiler/js-generic-lowering.cc
diff --git a/src/compiler/js-generic-lowering.cc b/src/compiler/js-generic-lowering.cc
index d326e806078f83197c5734406a872fa5e360c3d3..cf9ef1717177b593119b5326bc214938cbc91a95 100644
--- a/src/compiler/js-generic-lowering.cc
+++ b/src/compiler/js-generic-lowering.cc
@@ -397,7 +397,9 @@ bool JSGenericLowering::TryLowerDirectJSCall(Node* node) {
   Handle<Object> func = function_const.Value().handle();
   if (!func->IsJSFunction()) return false;  // not a function.
   Handle<JSFunction> function = Handle<JSFunction>::cast(func);
-  if (arg_count != function->shared()->formal_parameter_count()) return false;
+  if (arg_count != function->shared()->internal_formal_parameter_count()) {
+    return false;
+  }
 
   // Check the receiver doesn't need to be wrapped.
   Node* receiver = node->InputAt(1);