Declare 'this' as DYNAMIC_GLOBAL on the script_scope

test/mjsunit/global-arrow-delete-this.js

+// 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.
+
+// Make sure that we correctly resolve this when compiling an arrow function in
+// a with scope in an arrow function.
+a = () => {
+  let x
+  with ({}) x = () => { "use strict"; delete this }
+  return x
+}
+a()()

[adamk, 2016/08/11 18:27:17]

Do you want to assert something here? (what was the behavior before?)

[Toon Verwaest, 2016/08/12 04:49:40]

It dcheck fails in the back-ends if I don't create the this bindings in the
correct way. These two subtests check that it works in all cornercases.

[Toon Verwaest, 2016/08/12 04:58:46]

Plus delete this throws in strict mode if it doesn't work properly. (Doesn't
identify this as this)

+
+
+// Make sure that we correctly resolve this when compiling a program in an arrow
+// function.
+a = ()=>eval('"use strict"; delete this')
+a()