Add support for elements and array indices in Object.defineProperty...

test/mjsunit/regress/regress-619.js

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-// When this bug is corrected move to object-define-property and add
-// additional tests for configurable in the same manner as existing tests
-// there.
+// Tests that Object.defineProperty works correctly on array indices. 
+// Please see http://code.google.com/p/v8/issues/detail?id=619 for details.
 
 var obj = {};
 obj[1] = 42;
 assertEquals(42, obj[1]);
 Object.defineProperty(obj, '1', {value:10, writable:false});
 assertEquals(10, obj[1]);
 
 // We should not be able to override obj[1].
 obj[1] = 5;
 assertEquals(10, obj[1]);
@@ skipping 12 matching lines @@
 }
 
 for(var i = 0; i < 1024; i++) {
   obj[1] = 5;
 }
 
 for(var i = 0; i < 1024; i++) {
   assertEquals(i, obj[i]);
 }