[Bug 761851] video: add orc UYVY422 to GRAY8 conversion function

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=761851

--- Comment #7 from Göran Jönsson <goran.jonsson at axis.com> ---
Do it all in one instruction is easy I will say, but the last word will be
yours of course. Do you want me to implement something different ? Or maybe I
should commented it for better readability ? 

When I run 
ORC_DEBUG=2 installation/bin/gst-launch-1.0 videotestsrc num-buffers=1
pattern=red ! video/x-raw,format=UYVY,width=4,height=4 ! videoconvert !
video/x-raw,format=GRAY8 ! fakesink dump=true

I got 
ORC: WARNING: orccompiler.c(392): orc_program_compile_full(): program
video_orc_convert_UYVY_GRAY8 failed to compile, reason: no code generation rule
for ldresnearb on target sse
Pipeline is PREROLLED ...
Setting pipeline to PLAYING ...
New clock: GstSystemClock
00000000 (0x190e8b0): 51 51 51 51 51 51 51 51 51 51 51 51 51 51 51 51 
QQQQQQQQQQQQQQQQ
Got EOS from element "pipeline0".
Execution ended after 0:00:00.000071883
Setting pipeline to PAUSED ...
Setting pipeline to READY ...
Setting pipeline to NULL ...
Freeing pipeline ...

Maybe the print 
ORC: WARNING: orccompiler.c(392): orc_program_compile_full(): program
video_orc_convert_UYVY_GRAY8 failed to compile, reason: no code generation rule
for ldresnearb on target sse

gives another reason for not using ldresnearb ?

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