Fixed patch 3, the previous one didn't compile and would also have had
a bug where it didn't compile.
The storage location of db_render_override is a bit dubious, any better
ideas? Create si_db_misc_state? Create si_db_framebuffer_state?
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mesa-dev mai
Performance numbers are still the same.
I've addressed almost all the concerns. Registers that shouldn't be
used when depth htile is disabled are still written anyway because
I figured it's no big overhead, simpler, and possibly safer.
si_texture_htile_alloc_size() is modeled after
si_texture_get_c
