[Bug 91926] [SKL bisected] texsubimage pbo intermittent failures

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https://bugs.freedesktop.org/show_bug.cgi?id=91926

--- Comment #13 from Topi Pohjolainen <topi.pohjolainen at intel.com> ---
I was able to narrow down the combination of _mesa_update_state() and
brw_emit_mi_flush(). I got it simplified to a call _mesa_update_texture()
followed by part of the logic in brw_context.c:intel_update_state() - namely
calling brw_render_cache_set_check_flush() at least once. That call in turn is
simple check for existence of the underlying buffer object of the texture and
then a call to brw_emit_mi_flush().

So, after more simplification, I found out that if I'm calling
brw_emit_mi_flush() _twice_ after the call for _mesa_meta_pbo_TexSubImage() in
intelTexSubImage() I'm not able to reproduce the error. Recall that calling
brw_emit_mi_flush() isn't enough.

This is turn means that I'm mostly likely in square one - I'm simple changing
the dynamics enough to hide the real bug.

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