This test starts failing when the --harmony-array flag is turned on,
but the failure does not directly have to do with that flag. Disabling
the test in debug mode to unblock the release.
BUG=v8:4237
LOG=n
R=adamk,erikcorry
Review URL: https://codereview.chromium.org/
1202523005
Cr-Commit-Position: refs/heads/master@{#29207}
'regress/regress-3717': [SKIP],
# Issue 478788.
'es7/object-observe': [SKIP],
+
+ # BUG(v8:4237)
+ 'regress/regress-3976': [SKIP],
}], # 'gc_stress == True'
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