Disable webkit/array-iterate-backwards test in --gc-stress mode for turbofan

TBR=bmeurer@chromium.org

Review URL: https://codereview.chromium.org/647743002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@24530 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

test/webkit/webkit.status

@@ -59,5 +59,10 @@
   'fast/js/excessive-comma-usage': [SKIP]
 }],  # 'gc_stress == True'
 
+['gc_stress == True and mode == debug', {
+  # Skip tests that timout with turbofan.
+  'array-iterate-backwards': [PASS, NO_VARIANTS]
+}],  # 'gc_stress == True and mode == debug'
+
 ##############################################################################
 ]