Deindirect source elements in zend_hash_merge

If the RHS has INDIRECT elements, we do not those to be added to
the LHS verbatim. As we're using UPDATE_INDIRECT, we might even
create

Deindirect source elements in zend_hash_merge

If the RHS has INDIRECT elements, we do not those to be added to
the LHS verbatim. As we're using UPDATE_INDIRECT, we might even
create a nested INDIRECT that way.

This is a side-quest of oss-fuzz #26245.

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