[mjsunit] Skip test on ARM

TBR=ulan@chromium.org

Change-Id: Ic886973633b3631a336b5e549bb4c910d82fe57e
Notry: true
Reviewed-on: https://chromium-review.googlesource.com/c/1495988
Commit-Queue: Sigurd Schneider <sigurds@chromium.org>
Reviewed-by: Sigurd Schneider <sigurds@chromium.org>
Cr-Commit-Position: refs/heads/master@{#59972}

test/mjsunit/mjsunit.status

@@ -575,6 +575,9 @@
   # BUG(v8:4016)
   'regress/regress-crbug-467047': [SKIP],
 
+  # OOMing tests
+  'regress/regress-500980': [SKIP],
+
   # Slow tests.
   'array-concat': [PASS, SLOW],
   'array-indexing': [PASS, SLOW],