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lima: handle early-z and pixel kill better

Vasily Khoruzhick requested to merge anarsoul/mesa:lima-pixel-kill into master

[1] calls bit 12 of aux0 'pixel kill' which is likely forward pixel kill described in [2]. Blob sets this bit if early-z is enabled and blending is disabled and colormask is RGBA.

Bit 8 seems to be always enabled with bit 9 (early-z).

Let's mimic blob behavior.

[1] https://web.archive.org/web/20171026123213/http://limadriver.org/Render_State/ [2] https://community.arm.com/developer/tools-software/graphics/b/blog/posts/killing-pixels---a-new-optimization-for-shading-on-arm-mali-gpus

Signed-off-by: Vasily Khoruzhick anarsoul@gmail.com

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