Take two of the math128 bits..
Changes since last time:
- Added gcc __int128 versions for where it works
- Added Andy's mul_u64_u32_shr() due to popular demand :-)
- Added {shl,shr}_u128 as requested by hpa (although I suspect he'll
use Andy's fancy function).
- Added a U128_INIT() constant initializer.
- Renamed mult_u128 to mul_u64_u64, hpa complaned the name was
misleading
- Fixed some of the code generation issues with add_u128 and
mul_u64_64.
I've also assumed we're all actually ok with adding this functionality,
so unless someone hollers I'll push this for inclusion.
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