Revert of Rewrite scopes of non-simple default arguments

test/mjsunit/regress/regress-616386.js

Index: test/mjsunit/regress/regress-616386.js
diff --git a/test/mjsunit/regress/regress-616386.js b/test/mjsunit/regress/regress-616386.js
deleted file mode 100644
index d462ab7509c32724b44a1e5862acd98920d9983a..0000000000000000000000000000000000000000
--- a/test/mjsunit/regress/regress-616386.js
+++ /dev/null
@@ -1,10 +0,0 @@
-// Copyright 2016 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: --no-lazy
-
-assertEquals(0, ((y = (function(a2) { bbbb = a2 }), bbbb = eval('1')) => {y(0); return bbbb})())
-assertEquals(0, (({y = (function(a2) { bbbb = a2 }), bbbb = eval('1')} = {}) => {y(0); return bbbb})())
-assertEquals(0, (function (y = (function(a2) { bbbb = a2 }), bbbb = eval('1')) {y(0); return bbbb})())
-assertEquals(0, (function ({y = (function(a2) { bbbb = a2 }), bbbb = eval('1')} = {}) {y(0); return bbbb})())