anv/image: Allow HiZ on input attachment-capable depth/stencil images
anv/image: Allow HiZ on input attachment-capable depth/stencil images

While an input attachment may only take on one of those two layouts,
other depth/stencil attachments that use the same image may have
HiZ-enabled layouts. Improves the average frame rate on a release
candidate of a proprietary Vulkan benchmark by 9.94% over 3 runs on my
SKL GT4.

Signed-off-by: Nanley Chery <d78cd5d33e98a5581566f188959f731bd0b1c0fd@intel.com>
Reviewed-by: Jason Ekstrand <68c46a606457643eab92053c1c05574abb26f861@jlekstrand.net>

metora/MesaGLSLCompiler,metora/MesaGLSLCompiler,metora/MesaGLSLCompiler