anv: Allocate hiz surface
anv: Allocate hiz surface

Nanley Chery:
(rebase)
 - Use isl_surf_get_hiz_surf()
(amend)
 - Only add a HiZ surface onto a depth/stencil attachment
 - Add comment above HiZ surface addition
 - Hide HiZ behind INTEL_VK_HIZ prior to BDW
 - Disable HiZ for untested cases
 - Remove DISABLE_AUX_BIT instead of preventing it from being added

Signed-off-by: Nanley Chery <d78cd5d33e98a5581566f188959f731bd0b1c0fd@intel.com>
Reviewed-by: Jason Ekstrand <68c46a606457643eab92053c1c05574abb26f861@jlekstrand.net>
Reviewed-by: Chad Versace <4b94d436ff8c93527a96d251ac64b06311506efe@chromium.org>

metora/MesaGLSLCompiler,metora/MesaGLSLCompiler,metora/MesaGLSLCompiler