[test] Skip webkit test too slow for ppc.

test/webkit/webkit.status

 # Copyright 2013 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 48 matching lines @@
   'dfg-int-overflow-in-loop': [SKIP],
 }],  # 'arch == arm64 and simulator_run == True'
 ['dcheck_always_on == True and (arch == arm or arch == arm64)', {
   # Doesn't work with gcc 4.6 on arm or arm64 for some reason.
   'reentrant-caching': [SKIP],
 }],  # 'dcheck_always_on == True and (arch == arm or arch == arm64)'
 ['arch == mips', {
   # Too slow for mips big-endian boards on bots (no FPU).
   'dfg-int-overflow-in-loop': [SKIP],
 }], # 'arch == mips'
+['arch == ppc or arch == ppc64', {
+  # Too slow.
+  'dfg-int-overflow-in-loop': [SKIP],
+}], # 'arch == ppc or arch == ppc64'
 
 ##############################################################################
 ['asan == True', {
   # Skip tests not suitable for ASAN.
   'fast/js/excessive-comma-usage': [SKIP],
 
   # BUG(v8:4499).
   'run-json-stringify': [SKIP],
 }],  # 'asan == True'
 
 ##############################################################################
 ['isolates', {
   # BUG(v8:4499).
   '*': [SKIP],
 }],  # 'isolates'
 
 ##############################################################################
 ['gc_stress == True', {
   # Tests taking too long
   'fast/js/excessive-comma-usage': [SKIP]
 }],  # 'gc_stress == True'
 
 ['gc_stress == True and mode == debug', {
   # Skip tests that timeout.
 }],  # 'gc_stress == True and mode == debug'
 
 ##############################################################################
 ]