Fix JIT typed property inc/dec

This was leaking memory for pre-inc/dec of a refcounted typed
property if the result was not used.

The code to do this was unnecessarily complicat

Fix JIT typed property inc/dec

This was leaking memory for pre-inc/dec of a refcounted typed
property if the result was not used.

The code to do this was unnecessarily complicated, we can base
this on the zend_jit_inc/dec_typed_prop() helper and copy to the
result afterwards.

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