[src] Be careful during hash marking never to mark a non-PObj key as live. (How do you know it's not a PObj?  PObjs never have a value of zero, being pointers.)
[src] Be careful during hash marking never to mark a non-PObj key as live.
(How do you know it's not a PObj?  PObjs never have a value of zero, being
pointers.)

I'm not positive that the value should be marked in this case, but no tests
fail with the code as it is, so it may be correct.

git-svn-id: 6e74a02f85675cec270f5d931b0f6998666294a3@22153 d31e2699-5ff4-0310-a27c-f18f2fbe73fe

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