Move Object.assign implementation to C++

test/mjsunit/harmony/proxies-object-assign.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.
+
+// Flags: --harmony-proxies
+
+var handler = {
+  ownKeys: function(t) { return ["a", "b"]; },
+  getOwnPropertyDescriptor: function(t, p) {
+    return {enumerable: true, configurable: true}
+  },
+  get: function(t, p) {
+    return 1;
+  }
+};
+
+var proxy = new Proxy({}, handler);
+
+var o = {};
+
+Object.assign(o, proxy);
+
+assertEquals({"a": 1, "b": 1}, o);

[Toon Verwaest, 2015/12/11 10:06:07]

Could you add a test for string sources just to make sure we don't break it?
That's the only interesting case for TO_OBJECT(source).

d8> o = {}
{}
d8> Object.assign(o, "bla")
{0: "b", 1: "l", 2: "a"}

[Jakob Kummerow, 2015/12/11 12:04:10]

Done.