intel/fs/gen11+: Handle ROR/ROL in lower_simd_width().

intel/fs/gen11+: Handle ROR/ROL in lower_simd_width().

Prevents invalid code from being emitted for ROR/ROL instructions in
SIMD32 shaders.

The problem can be reproduced with the following tests while forcing
SIMD32 to be used for fragment shaders:

 piglit.shaders.glsl-rotate-left
 piglit.shaders.glsl-rotate-right

However the issue could occur in production already with compute
shaders and a workgroup size large enough to trigger SIMD32 dispatch.

Fixes: 83fdec0f0de "intel/compiler: Enable the emission of ROR/ROL instructions"
Cc: Sagar Ghuge <sagar.ghuge@intel.com>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>