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

src/compiler.cc

Index: src/compiler.cc
diff --git a/src/compiler.cc b/src/compiler.cc
index 5d605fd3e2ecbf026bdc65fe4cb486d4f9f10d95..4b4c9105908cb337869f5d273d8dd541f9f5148a 100644
--- a/src/compiler.cc
+++ b/src/compiler.cc
@@ -618,7 +618,12 @@ static void SetFunctionInfo(Handle<SharedFunctionInfo> function_info,
                             bool is_toplevel,
                             Handle<Script> script) {
   function_info->set_length(lit->parameter_count());
-  function_info->set_formal_parameter_count(lit->parameter_count());
+  if (FLAG_experimental_classes && IsSubclassConstructor(lit->kind())) {
+    function_info->set_internal_formal_parameter_count(lit->parameter_count() +
+                                                       1);
+  } else {
+    function_info->set_internal_formal_parameter_count(lit->parameter_count());
+  }
   function_info->set_script(*script);
   function_info->set_function_token_position(lit->function_token_position());
   function_info->set_start_position(lit->start_position());