[proxies] Make Object.{isFrozen,isSealed} behave correctly for proxies.

test/mjsunit/regress/regress-380049.js

Index: test/mjsunit/regress/regress-380049.js
diff --git a/test/mjsunit/regress/regress-380049.js b/test/mjsunit/regress/regress-380049.js
deleted file mode 100644
index a78626cc546cbe4aa42cd53349c1e288ac1a07ec..0000000000000000000000000000000000000000
--- a/test/mjsunit/regress/regress-380049.js
+++ /dev/null
@@ -1,9 +0,0 @@
-// Copyright 2014 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: --allow-natives-syntax
-
-function foo(a,b,c) { return arguments; }
-var f = foo(false, null, 40);
-assertThrows(function() { %ObjectFreeze(f); });