[Bug 77223] [BDW]Piglit spec_ARB_texture_cube_map_copyteximage_CUBE_samples=2 fails

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=77223

--- Comment #2 from Kenneth Graunke <kenneth at whitecape.org> ---
This works if you disable fast depth clears.

It also works if you add a PIPE_CONTROL with a TC flush at the end of
gen8_hiz_exec.  I found documentation saying we may need a DEPTH_CACHE_FLUSH
and DEPTH_STALL, but nothing about a TC flush.  Need to investigate more...

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