lib/n/math: Bit_ functions should be on sized native integers
lib/n/math: Bit_ functions should be on sized native integers

Some could be defined on Uint and Int (like Bit_ffs), as they do not
depend on the bit width of the integer type. We're considering this to
be a bad idea at the moment.

nanocritical/n,nanocritical/n,nanocritical/n,nanocritical/n