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}