[Bug 236003] x11-drivers/xf86-video-intel: update to 2019-12-09 snapshot and refactor

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=236003

--- Comment #42 from Theron Tarigo <theron at freebsd.org> ---
No, with your patches I have been able to use latest fbsd-12.0-kmod (4.12). 
Looks like I forgot to let you know when I first tried this and found that it
is working.  Also seems to work just as well with your latest patch (v7.3).

I'm still using TearFree option, SNA, and no compositor daemon.
The adapter is Intel(R) HD Graphics 530 (Skylake GT2)  (0x191b)
OpenGL works beautifully at 60fps, vsync, never tearing.  However, nothing
seems to play video at 60fps - Mplayer, Chromium, Firefox all drop frames,
listed here in order of increasing severity.

Can someone explain to me why "modesetting" is "the future" and
xf86-video-intel is "legacy"?  My experience has been that either Modesetting
is fundamentally broken in design, or it really is just a bug for its entire
existence that it allows frame-tearing.

Probably not directly relevant, but both intel and modesetting waste about 4
watts of battery power compared to scfb driver, with everything else being
equal, including drm module being loaded in all cases.  I might actually save
power overall by just using scfb and VirtualGL+Nvidia for OpenGL tasks when I
need them.

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