Reapply revisions 1432, 1433, 1469 and 1472 while fixing issue 279.

test/mjsunit/regress/regress-279.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
@@ skipping 32 matching lines @@
 b = makeObjectInObject();
 assertEquals('undefined', typeof(b.foo.bar), "Object in object");
 
 function makeObjectInArray() {
   return [ {} ];
 }
 
 a = makeObjectInArray();
 a[0].bar = 1;
 b = makeObjectInArray();
-assertEquals('undefined', typeof(b[0].bar), "Object in object");
+assertEquals('undefined', typeof(b[0].bar), "Object in array");
+
+function makeArrayInArray() {
+  return [ [] ];
+}
+
+a = makeArrayInArray();
+a[0].push(5);
+b = makeArrayInArray();
+assertEquals(0, b[0].length, "Array in array");