Add support for getOwnPropertyDescriptor on array indices (fixes issue 599)....

test/es5conform/es5conform.status

 # 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 182 matching lines @@
 
 # SUBSETFAIL
 chapter15/15.2/15.2.3/15.2.3.4/15.2.3.4-4-33: FAIL_OK
 
 # SUBSETFAIL
 chapter15/15.2/15.2.3/15.2.3.4/15.2.3.4-4-34: FAIL_OK
 
 # SUBSETFAIL
 chapter15/15.2/15.2.3/15.2.3.4/15.2.3.4-4-35: FAIL_OK
 
-# getOwnPropertyDescriptor not implemented on array indices
-chapter15/15.2/15.2.3/15.2.3.4/15.2.3.4-4-b-1: FAIL_OK
-
-
-
 
 # We fail this because Object.keys returns numbers for element indices
 # rather than strings.
 #chapter15/15.2/15.2.3/15.2.3.14/15.2.3.14-3-3: FAIL_OK
 
 chapter15/15.3: UNIMPLEMENTED
 
 chapter15/15.4/15.4.4/15.4.4.14: UNIMPLEMENTED
 chapter15/15.4/15.4.4/15.4.4.15: UNIMPLEMENTED
 chapter15/15.4/15.4.4/15.4.4.20: UNIMPLEMENTED
@@ skipping 35 matching lines @@
 
 # Same as 15.4.4.16-7-7
 chapter15/15.4/15.4.4/15.4.4.18/15.4.4.18-7-6: FAIL_OK
 
 # Same as 15.4.4.16-5-1
 chapter15/15.4/15.4.4/15.4.4.19/15.4.4.19-5-1: FAIL_OK
 
 # Same as 15.4.4.16-7-7
 chapter15/15.4/15.4.4/15.4.4.19/15.4.4.19-8-7: FAIL_OK
 
-# Uses a array index number as a property
-chapter15/15.4/15.4.4/15.4.4.19/15.4.4.19-8-c-iii-1: FAIL_OK
-
 
 chapter15/15.5: UNIMPLEMENTED
 chapter15/15.6: UNIMPLEMENTED
 chapter15/15.7: UNIMPLEMENTED
 chapter15/15.9: UNIMPLEMENTED
 chapter15/15.10: UNIMPLEMENTED
 chapter15/15.12: UNIMPLEMENTED
 
 [ $arch == mips ]
 
 # Skip all tests on MIPS.
 *: SKIP