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    Subject[PATCH 0/2] math128 - v2
    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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