Fix issue with skipping global object during lookup through...

test/mjsunit/global-deleted-property-ic.js

+// Copyright 2009 the V8 project authors. All rights reserved.
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+//       notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+//       copyright notice, this list of conditions and the following
+//       disclaimer in the documentation and/or other materials provided
+//       with the distribution.
+//     * Neither the name of Google Inc. nor the names of its
+//       contributors may be used to endorse or promote products derived
+//       from this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+function LoadX(obj) { return obj.x; }
+
+// Load x from the prototype of this. Make sure to initialize the IC.
+this.__proto__ = { x: 42 };
+assertEquals(42, LoadX(this));

[bak, 2009/07/08 07:09:50]

How about:
   for(var i = 0; i < 3; i++) assertEquals(....)

+assertEquals(42, LoadX(this));
+assertEquals(42, LoadX(this));
+
+// Introduce a global variable and make sure we load that from LoadX.
+this.x = 87;
+assertEquals(87, LoadX(this));
+assertEquals(87, LoadX(this));
+assertEquals(87, LoadX(this));
+
+// Delete the global variable and make sure we get back to loading from
+// the prototype.
+delete this.x;
+assertEquals(42, LoadX(this));
+assertEquals(42, LoadX(this));
+assertEquals(42, LoadX(this));
+
+// ... and go back again to loading directly from the object.
+this.x = 99;
+assertEquals(99, LoadX(this));
+assertEquals(99, LoadX(this));
+assertEquals(99, LoadX(this));