[TODO] Implement .loadlib pragma in IMCC

[Audrey Tang]

Allison and Chip expressed their go-ahead with a .loadlib pragma, to replace this current use:

.sub foo :immediate
    $I0 = loadlib "XXX"
.end

With this:

.loadlib "XXX"


actually have to invoke Parrot themselves.

Thanks,
Audrey

This might be done as part of vsoni's IMCC refactoring, or as a lexer action that loads the library as soon as this directive is seen. In any case, this will let dependency checkers have a much easier time to figure out what dynamic libraries a .pir file is loading, without

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