Remove CONSTR_CHARLIKE and CONSTR_INTLIKE closure types
These closure types aren't used/needed, as far as I can tell. The commoning up of Chars/Ints happens by comparing info pointers, and the info table for a dynamic C#/I# is CONSTR_0_1. The RTS seemed a little confused about whether CONSTR_CHARLIKE/CONSTR_INTLIKE were supposed to be static or dynamic closures, too.
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