[cairo] MMX optim patches to review...

[Frederic Plourde]

Hi there!

 Here are some other important optims that I wrote for pixman-mmx.c
I'd be pleased if you guys reviewed them (in relation to my previous questions
about _mm_mulhi_pu16 intrinsic in my last email on cairographics...).

the perf chart is great. 12% mean speedup for affected parts of the mmx
codepath.

thanx :-)
-fred-
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