intel/fs: reduce register usage for relocated constants

intel/fs: reduce register usage for relocated constants

Commit bb8e31b7ed ("anv: avoid hardcoding instruction VA constant in
shaders") had a slight negative impact on shaders (Red Dead Redemption
2 in particular). Dropping a few shaders from SIMD32 to SIMD16.

With this change, it brings back all the dropped SIMD32 shaders.

Signed-off-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Reviewed-by: Ivan Briano <ivan.briano@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/22872>