Skip new_oom.phpt if ZMM is disabled

Test requires ZMM

ensure displays_errors is off (default)

Fix uouv on oom on object allocation

We may OOM during object initialization. In this case, free_obj needs to guard
against NULL values. There may be more cases where this is an issue, t

Fix uouv on oom on object allocation

We may OOM during object initialization. In this case, free_obj needs to guard
against NULL values. There may be more cases where this is an issue, these were
the ones I was able to discover via script.

Fixes GH-11734

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