After reviewing, unfortunately, your fix is not fully correct and not well, first it crash with:

<?php
function test() {
    class C1 {
        use T1, T2 {
            T1::foo insteadof T2;
            T1::bar insteadof T2;
        }
    }
}

and you introduced a new no necessary flag.

I got a better fix, and committed in f039225

it also use less memory occupation.

please close this PR if you have no problems.

(sorry for delay, was busy with zend signals)

thanks

Great!