Disable webkit/array-iterate-backwards for debug builds.

test/webkit/webkit.status

Index: test/webkit/webkit.status
diff --git a/test/webkit/webkit.status b/test/webkit/webkit.status
index c33f1b928e7c208f1c260f3cae1136e0df338cde..fb8d77d8d2069abdb90594d7bef57155f7e4f0a5 100644
--- a/test/webkit/webkit.status
+++ b/test/webkit/webkit.status
@@ -44,9 +44,8 @@
   'dfg-double-vote-fuzz': [SKIP],
   'reentrant-caching': [SKIP],
   'sort-large-array': [SKIP],
-  # Too slow on windows with --nocrankshaft.
-  # TODO(mstarzinger): Too slow with TF.
-  'array-iterate-backwards': [PASS, NO_VARIANTS],
+  # Too slow with --enable-slow-asserts.
+  'array-iterate-backwards': [SKIP],
 }],  # 'mode == debug'
 ['simulator', {
   # Skip tests that timeout with turbofan.
@@ -71,7 +70,6 @@
 
 ['gc_stress == True and mode == debug', {
   # Skip tests that timeout.
-  'array-iterate-backwards': [SKIP]
 }],  # 'gc_stress == True and mode == debug'
 
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