[Bug 90422] [SKL] Many Piglit multisample tests fail

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=90422

--- Comment #4 from Neil Roberts <neil at linux.intel.com> ---
I can make the test pass by causing a flush in PatternRender::draw in between
where it renders to the texture and then calls glBlitFramebuffer to sample from
it with some gdb commands like this:

 b formats.cpp:326
 commands 1
 call intel_batchbuffer_emit_mi_flush(_glapi_Context)
 c
 end

This is mysterious because Mesa does seem to do its own flush when a buffer is
switched from rendering to sampling in brw_render_cache_set_check_flush and
this does seem to successfully call intel_batchbuffer_emit_mi_flush. I thought
maybe it's something about needing to flush twice but I tried duplicating the
call to intel_batchbuffer_emit_mi_flush in that function and that doesn't solve
it.

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