[perl #46683] [TODO] [C] Walk the fixups, locate globals and nullify the Sub PMC

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# New Ticket Created by  Paul Cochrane 
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In src/pmc/eval.pmc:destroy() there is the todo item:

        * These globals still exist, calling them will segfault
        * as the segment is destroyed now.
        *
        * TODO walk the fixups for this segment, locate globals
        *      and nullify the Sub PMC.
        * This probably needs a pointer into the globals.
        *
        * OTOH - if the global exists - this eval pmc ought
        *        to be alive and destroy isn't called.

This needs to be implemented.