i965: Properly flush in hsw_pause_transform_feedback().
Fixes a number of transform feedback tests when run with Linux 4.8, which allows us to use the MI_LOAD_REGISTER_REG command, at which point we started using this new broken path. ES3-CTS.functional.transform_feedback.array_element.interleaved.lines.* and Piglit's arb_transform_feedback2/draw-auto are both fixed by this patch, for example. Thanks to Chris Wilson for catching this mistake! Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=99030 Signed-off-by:Kenneth Graunke <kenneth@whitecape.org> Reviewed-by:
Anuj Phogat <anuj.phogat@gmail.com>