[cairo] [patch] pixman_fill_rect implementations for specific bpp modes

[Aivars Kalvans]

pixman_fill_rect_general() is implicitly called from
gdk_window_clear_backing_rect() and takes about 20% of gnome-terminal's
time when doing `ls -laR /` or `cat large-file` (not counting X). Adding
specific implementation for 16bpp mode reduces that to less than 10%.

I can send sysprof profile if anyone wants to look at it.

-- 
Aivars

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