Fix rc info of iterator_to_array

[iluuu1994]

This function can now return a copy of the provided array, resulting in
a value of RC != 1.

[cmb69]

Good catch, thank you!

[TimWolla]

I can confirm that I added a RETURN_COPY there. Is there some reference documentation for the @refcount values so I can learn what they mean?

[iluuu1994]

@TimWolla It's a guarantee that the function will return a value with the given refcount. Adding this attribute gives the optimizer more information about the value, although I don't know exactly in what ways it's used.

[cmb69]

I don't think there's any documentation about func_infos. Might be a good idea to put something up at https://www.phpinternalsbook.com/.