Temporarily disable mjsunit/call-counts test until --vector-stores is prermanently enabled.

BUG=v8:4458
LOG=N
NOTRY=true

Review URL: https://codereview.chromium.org/1387533002

Cr-Commit-Position: refs/heads/master@{#31067}

test/mjsunit/mjsunit.status

@@ -248,6 +248,10 @@
   # BUG(v8:3838).
   'regress/regress-3116': [PASS, ['isolates', FLAKY]],
 
+  # BUG(v:4458). TODO(mvstanton): reenable the test once --vector-stores is
+  # prermanently enabled.
+  'call-counts': [SKIP],
+
   # BUG(chromium:508074). Remove this once the issue is fixed.
   'harmony/arrow-rest-params': [PASS, NO_VARIANTS],
   'harmony/rest-params': [PASS, ['no_snap == True', NO_VARIANTS]],