Fix use-after-free in property coercion with __toString()

This was only partially fixed in PHP-8.3. Backports and fixes the case for both
initialized and uninitialized property writes.

Fix use-after-free in property coercion with __toString()

This was only partially fixed in PHP-8.3. Backports and fixes the case for both
initialized and uninitialized property writes.

Fixes GH-14969
Closes GH-14971

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