feat: constify bitwise and shift functions #441
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const fn <op>
for all bitwise and, or, xoris_zero
,*shl
,*shr
,rotate*
,count*
constWIP:
is_zero
actually performs worse because we have to manually implement equality, and I cannot get the compiler to generate optimal code. See https://godbolt.org/z/aM1nE1Pfh