Make test runner more flexible for running fast tests.

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 63 matching lines @@
   'ecma_3/Date/15.9.3.2-1': [SKIP],
   'js1_2/function/Number': [SKIP],
 
   # TODO(2018): Temporarily allow timeout in debug mode.
   'js1_5/GC/regress-203278-2': [PASS, ['mode == debug', TIMEOUT, FAIL]],
 
   ##################### SLOW TESTS #####################
 
   # This takes a long time to run (~100 seconds). It should only be run
   # by the really patient.
-  'js1_5/GC/regress-324278': [SLOW],
+  'js1_5/GC/regress-324278': [SKIP],
 
   # This takes a long time to run because our indexOf operation is
   # pretty slow - it causes a lot of GCs; see issue
   # #926379. We could consider marking this SKIP because it takes a
   # while to run to completion.
-  'js1_5/GC/regress-338653': [SLOW],
+  'js1_5/GC/regress-338653': [SKIP],
 
   # This test is designed to run until it runs out of memory. This takes
   # a very long time because it builds strings character by character
   # and compiles a lot of regular expressions. We could consider marking
   # this SKIP because it takes a while to run to completion.
-  'js1_5/GC/regress-346794': [SLOW],
+  'js1_5/GC/regress-346794': [SKIP],
 
   # Runs out of memory while trying to build huge string of 'x'
   # characters. This takes a long time to run (~32 seconds).
-  'js1_5/GC/regress-348532': [SLOW],
+  'js1_5/GC/regress-348532': [SKIP],
 
 
   ##################### FLAKY TESTS #####################
 
   # These tests time out in debug mode but pass in product mode
   'js1_5/Regress/regress-360969-03': [PASS, ['mode == debug', TIMEOUT]],
   'js1_5/Regress/regress-360969-04': [PASS, ['mode == debug', TIMEOUT]],
   'js1_5/Regress/regress-360969-05': [PASS, ['mode == debug', TIMEOUT]],
   'js1_5/Regress/regress-360969-06': [PASS, ['mode == debug', TIMEOUT]],
   'js1_5/extensions/regress-365527': [PASS, ['mode == debug', TIMEOUT]],
@@ skipping 736 matching lines @@
   '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],
 }],  # 'arch == mipsel'
 ]