Uncomment native bit shift candidates
Uncomment native bit shift candidates

All the things in RT#125466 [^1] are now fixed[^2], as
far as I can tell, so unfudge these routines that were
fudged as part of the workaround for that ticket.

[1] https://rt.perl.org/Ticket/Display.html?id=125466
[2] https://github.com/rakudo/rakudo/commit/29fdb75a30

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