Fix #77638: var_export'ing certain class instances segfaults

If objects return immutable property hash tables (typically,
`zend_empty_array`), we must not try to apply recursion protecti

Fix #77638: var_export'ing certain class instances segfaults

If objects return immutable property hash tables (typically,
`zend_empty_array`), we must not try to apply recursion protection on
those.

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