Disables flaky test-heap/Regress615489

Bug: v8:9400
Change-Id: I98123cba0c81d5a7437d0ad08cfac1b3a366bc0e
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1678357Reviewed-by: Sigurd Schneider <sigurds@chromium.org>
Reviewed-by: Yang Guo <yangguo@chromium.org>
Commit-Queue: Yang Guo <yangguo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#62400}

test/cctest/cctest.status

@@ -200,6 +200,12 @@
   'test-lockers/ExtensionsRegistration': [SKIP],
 }],  # 'no_snap == True'
 
+##############################################################################
+['no_snap == True and system != windows and mode == debug', {
+  # BUG(v8:9400).
+  'test-heap/Regress615489': [SKIP],
+}], # 'no_snap == True and system != windows and mode == debug'
+
 ##############################################################################
 # TODO(machenbach): Fix application of '*'. Nosnap windows needs a separate
 # section to not overwrite the expectations for TestThatAlwaysFails.