i965/miptree: Don't gtt map from map_depthstencil

Instead of gtt mapping, call out to other map functions (map_map
or map_tiled_memcpy) for the depth surface. Removes a place where
gtt mapping is used.

aubinator: add support for aubinating memtrace aubs

Memtrace aubs are similar to classic aubs, with the major
difference being how command submission is serialized (as register
writes instead of a high-level submit message). Some internal
tools generate or consume only memtrace aubs.

i965: Implement ARB_texture_filter_minmax

On gen >= 9, minmax reduction modes are available as a flag in
SAMPLER_STATE.

i965: Implement ARB_texture_filter_minmax

On gen >= 9, minmax reduction modes are available as a flag in
SAMPLER_STATE.

Mesa 17.2 branchpoint