for scalar==float, tis faster to always to MIN and MAX, than to put an ELSE

betwixt them.

    if (x < min) min = x; else if (x > max) max = x;

This expression forces the compiler to know if the min expression executed, and
insert a conditional jump before the max. Slow.

    if (x < min) min = x; if (x > max) max = x;

This version allows the compiler to emitt MINSS and MAXSS unconditionally, giving
us a loop with zero branches inside.



git-svn-id: http://skia.googlecode.com/svn/trunk@3939 2bbb7eff-a529-9590-31e7-b0007b416f81

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