Disable tests that are known to be non-deterministic in --verify-predictable mode.

NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true

Review URL: https://codereview.chromium.org/1621523003

Cr-Commit-Position: refs/heads/master@{#33457}

test/mjsunit/mjsunit.status

@@ -732,6 +732,7 @@
 
   # Skip tests that are known to be non-deterministic.
   'd8-worker-sharedarraybuffer': [SKIP],
+  'd8-os': [SKIP],
 }],  # 'predictable == True'
 
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