[harmony] Move some regression tests to the right place

test/mjsunit/regress/regress-crbug-448730.js

Index: test/mjsunit/regress/regress-crbug-448730.js
diff --git a/test/mjsunit/regress/regress-crbug-448730.js b/test/mjsunit/regress/regress-crbug-448730.js
deleted file mode 100644
index 31d276aa839cdf649b2da1ad54138cc4f9418b81..0000000000000000000000000000000000000000
--- a/test/mjsunit/regress/regress-crbug-448730.js
+++ /dev/null
@@ -1,14 +0,0 @@
-// 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: --allow-natives-syntax --harmony-proxies
-
-function bar() {}
-bar({ a: Proxy.create({}) });
-function foo(x) { x.a.b == ""; }
-var x = {a: {b: "" }};
-foo(x);
-foo(x);
-%OptimizeFunctionOnNextCall(foo);
-foo(x);