Skip test that times out.

test/mozilla/mozilla.status

 # Copyright 2011 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 841 matching lines @@
   'ecma/Date/15.9.5.8': [SKIP],
   'ecma/Date/15.9.5.10-2': [SKIP],
   'ecma/Date/15.9.5.11-2': [SKIP],
   'ecma/Date/15.9.5.12-2': [SKIP],
   'js1_5/Array/regress-99120-02': [SKIP],
   'js1_5/extensions/regress-371636': [SKIP],
   'js1_5/Regress/regress-203278-1': [SKIP],
   'js1_5/Regress/regress-404755': [SKIP],
   'js1_5/Regress/regress-451322': [SKIP],
 
-
   # BUG(1040): Allow this test to timeout.
   'js1_5/GC/regress-203278-2': [PASS, TIMEOUT, NO_VARIANTS],
 }],  # 'arch == arm or arch == arm64'
 
 
 ['arch ==  arm64', {
   # BUG(v8:3152): Runs out of stack in debug mode.
   'js1_5/extensions/regress-355497': [FAIL_OK, ['mode == debug', SKIP]],
+
+  # BUG(v8:3503): Times out in debug mode.
+  'js1_5/Regress/regress-280769-2': [PASS, FAIL, ['mode == debug', SKIP]],
 }],  # 'arch ==  arm64'
 
 
 ['arch == mipsel or arch == mips64el', {
 
   # BUG(3251229): Times out when running new crankshaft test script.
   'ecma_3/RegExp/regress-311414': [SKIP],
   'ecma/Date/15.9.5.8': [SKIP],
   'ecma/Date/15.9.5.10-2': [SKIP],
   'ecma/Date/15.9.5.11-2': [SKIP],
@@ skipping 42 matching lines @@
   'js1_5/Regress/regress-416628': [SKIP],
   'js1_5/extensions/regress-371636': [SKIP],
   'ecma_3/RegExp/regress-330684': [SKIP],
   'ecma_3/RegExp/regress-307456': [SKIP],
   'js1_5/Regress/regress-303213': [SKIP],
   'js1_5/extensions/regress-330569': [SKIP],
   'js1_5/extensions/regress-351448': [SKIP],
   'js1_5/extensions/regress-336410-1': [SKIP],
 }],  # 'arch == arm64 and simulator_run == True'
 ]