[Bug 236003] x11-drivers/xf86-video-intel: update to 2019-07-10 snapshot and refactor

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

--- Comment #19 from Jan Beich <jbeich at FreeBSD.org> ---
(In reply to Theron Tarigo from comment #18)
> Hi, I should have been paying attention to this bug by now, since I have
> Intel(R) HD Graphics 530 (Skylake GT2).  With what has been available in ports,
> everything since DRM 4.9 kmod (drm-fbsd11.2-kmod-4.9g20181023) has been
> unusable: With "intel" driver and SNA+TearFree, after a few minutes of Xorg
> running, or even after launching Firefox, performance becomes terrible, where
> it feels as though in each 1/60th of a second, there is only a one in three
> chance of a frame getting pushed to the display).

I'm on -CURRENT and don't use TearFree due to poor/jerky performance. A few
month ago I've seen severe redraw skips on TearFree but don't remember what
have fixed those: either upgrading drm-current-kmod to drm-devel-kmod or
disabling framebuffer compression.

If you see "(EE) intel(0): Failed to submit rendering commands (Bad address),
disabling acceleration." in Xorg.log on DRM > 4.9 then this update should help.
The full list of changes is documented in the commit message (read the diff).

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