Fix bug #81142 by adding zend_string_init_existing_interned()

Add a new interned string handler that fetches an interned string
if it exists, but does not create one if it does not (and

Fix bug #81142 by adding zend_string_init_existing_interned()

Add a new interned string handler that fetches an interned string
if it exists, but does not create one if it does not (and instead
returns a non-interned string).

This fixes bug #81142, by preventing the creating of new interned
strings for unserialized array keys.

Closes GH-7360.

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