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* Define a new private op constant OPpITER_REFALIAS * Presence of this flag on OP_ITER means the iteration var is a refalias * Throw away the LVREF/REFGEN part of the optree in favour of just setting this flag This change is useful on its own, and also a good stepping-stone towards being able to implement multiple refalias variables in foreach; as per https://github.com/Perl/perl5/issues/24027