i965: Resolve color and flush for all active shader images in intel_update_state().

i965: Resolve color and flush for all active shader images in intel_update_state().

Fixes arb_shader_image_load_store/execution/load-from-cleared-image.shader_test.

Couldn't reproduce any significant FPS regression in CPU-bound
benchmarks from the Finnish benchmarking system on neither VLV nor BSW
after 30 runs with 95% confidence level.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=92849
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Jason Ekstrand <jason.ekstrand@intel.com>
Cc: "11.0 11.1" <mesa-stable@lists.freedesktop.org>
Tested-by: Jordan Justen <jordan.l.justen@intel.com>
Reviewed-by: Kristian Høgsberg <krh@bitplanet.net>