i965/fs: Don't generate saturates over existing variable values.
Fixes a crash in http://workshop.chromeexperiments.com/stars/ on i965,
and the new piglit test glsl-fs-clamp-5.
We were trying to emit a saturating move into a uniform, which the code
generator appropriately choked on. This was broken in the change in
32ae8d3b321185a85b73ff703d8fc26bd5f48fa7.
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=57166
NOTE: This is a candidate for the 9.0 branch.
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
(cherry picked from commit b9b033d8e456228fb05c5e28f85323de40f3292f)
Conflicts: 9.0 doesn't have the MOV() helper. Convert to old style.
1 file changed