binvert_limb speedup on 64 bit machines with UHWtype

[John Gatrell]

I think you missed why the 0x7F is unnecessary. If you start with 8 bits
and divide by 2 then the top bit must become zero. gcc does this itself and
suppresses the 0x7F. So this idea will help other compilers start with
8-bits to achieve the same. The same trick can be used in hand-crafted
assembler implementations.
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