[SNB] INTEL_DEBUG=nohiz is likely broken for depth/stencil buffers

Submitted by Nanley Chery `@nchery`

Assigned to Intel 3D Bugs Mailing List

For SNB, INTEL_DEBUG=nohiz seems to be broken in two places:

In miptree_create() in intel_mipmap_tree.c. Trying to create a depth/stencil buffer will cause a depth miptree to be created without stencil.
In isl_genX(emit_depth_stencil_hiz_s) in isl_emit_depth_stencil.c. Emitting a depth/stencil buffer instruction will unconditionally force HiZ on.

I haven't tested/verified these observations.

mesa version: ae77f123

Version: git

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