i965/fs: Perform CSE on sends-from-GRF rather than textures.

Should potentially allow a few more cases, while avoiding doing CSE on
texture operations on Gen <= 6 with the MRF.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=80211
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Tested-by: lu hua <huax.lu@intel.com>
1 file changed