drm/i915: Flush pipecontrol post-sync writes

In order to flush the results from in-batch pipecontrol writes (used for
example in glQuery) before declaring the batch complete (and so declaring
the query results coherent), we need to set the FlushEnable bit in our
flushing pipecontrol. The FlushEnable bit "waits until all previous
writes of immediate data from post-sync circles are complete before
executing the next command".

I get GPU hangs on byt without flushing these writes (running ue4).
piglit has examples where the flush is required for correct rendering.

Signed-off-by: Chris Wilson <[email protected]>
Reviewed-by: Ville Syrjälä <[email protected]>
Acked-by: Daniel Vetter <[email protected]>
Cc: [email protected]
Signed-off-by: Jani Nikula <[email protected]>

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