SkJumper: set_rgb and swap_rb

swap_rb is a big limiting factor on Windows and Linux.
set_rgb just happened to be nearby and easy.

Change-Id: Ic529c7578eeb278476821090127fa8fb1f70c04f
Reviewed-on: https://skia-review.googlesource.com/8859
Reviewed-by: Herb Derby <herb@google.com>
Commit-Queue: Mike Klein <mtklein@chromium.org>
4 files changed