Introduce a BuiltinsConstructStub that sets up new.target and does a [[call]] per ES6 9.3.2

src/js/proxy.js

 // Copyright 2015 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 (function(global, utils) {
 
 "use strict";
 
 %CheckIsBootstrapping();
 
@@ skipping 10 matching lines @@
   MakeTypeError = from.MakeTypeError;
   ToNameArray = from.ToNameArray;
 });
 
 //----------------------------------------------------------------------------
 
 function ProxyCreate(target, handler) {
   if (!%_IsConstructCall()) {
     throw MakeTypeError(kConstructorNotFunction, "Proxy");
   }
-  // TODO(cbruni): Get the construct call right, this is just a prelimiary
-  // version to get started with tests.
-  return %CreateJSProxy(this, target, handler);
+  return %CreateJSProxy(target, handler);
 }
 
 function ProxyCreateFunction(handler, callTrap, constructTrap) {
   if (!IS_SPEC_OBJECT(handler))
     throw MakeTypeError(kProxyHandlerNonObject, "createFunction")
   if (!IS_CALLABLE(callTrap))
     throw MakeTypeError(kProxyTrapFunctionExpected, "call")
   if (IS_UNDEFINED(constructTrap)) {
     constructTrap = DerivedConstructTrap(callTrap)
   } else if (IS_CALLABLE(constructTrap)) {
@@ skipping 132 matching lines @@
   var handler = %GetHandler(proxy)
   if (IS_UNDEFINED(handler.enumerate)) {
     return %Apply(DerivedEnumerateTrap, handler, [], 0, 0)
   } else {
     return ToNameArray(handler.enumerate(), "enumerate", false)
   }
 }
 
 //-------------------------------------------------------------------
 %SetCode(GlobalProxy, ProxyCreate);
-%FunctionSetPrototype(GlobalProxy, new GlobalObject());
 
 //Set up non-enumerable properties of the Proxy object.
 utils.InstallFunctions(GlobalProxy, DONT_ENUM, [
   "createFunction", ProxyCreateFunction
 ]);
 
-%AddNamedProperty(GlobalProxy.prototype, "constructor", GlobalProxy, DONT_ENUM);
 // -------------------------------------------------------------------
 // Exports
 
 utils.Export(function(to) {
   to.ProxyDelegateCallAndConstruct = DelegateCallAndConstruct;
   to.ProxyDerivedHasOwnTrap = DerivedHasOwnTrap;
   to.ProxyDerivedKeysTrap = DerivedKeysTrap;
 });
 
 %InstallToContext([
   "derived_get_trap", DerivedGetTrap,
   "derived_has_trap", DerivedHasTrap,
   "derived_set_trap", DerivedSetTrap,
   "proxy_enumerate", ProxyEnumerate,
 ]);
 
 })