Make sure that fork child doesn't do incremental rehashing (#11692)
Turns out that a fork child calling getExpire while persisting keys (and possibly also a result of some module fork tasks) could cause dictFind to do incremental rehashing in the child process, which is both a waste of time, and also causes COW harm. (cherry picked from commit 2bec254d) (cherry picked from commit 3e82bdf7)
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