[perl #48280] [TODO] [C] Check for a sub with more up-to-date unit->type lookup

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# New Ticket Created by  Paul Cochrane 
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In compilers/imcc/cfg.c:find_basic_blocks() there is the todo item:

/* XXX FIXME: Now the way to check for a sub is unit->type */

Convert the code in these locations to use the more up-to-date method of
checking for a sub; namely a unit->type lookup/call/thingy.