Make Bool.ACCEPTS autothread
Make Bool.ACCEPTS autothread

Currently, Bool:U.ACCEPTS uses nqp to test for whether the passed arg
istype(Bool), but that will always be false for all Junctions.

Remove the Mu type constraint so we autothread and smartmatch of Junctions
against Bool type object does not produce incorrect results.

Fixes RT#130426: https://rt.perl.org/Ticket/Display.html?id=130426

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