Don't cast uvec4s as if those were floats

Take into account the override_no_cast flag in more places.

Fixes the following:

dEQP-GLES31.functional.compute.basic.image_atomic_op_local_size_8 dEQP-GLES31.functional.compute.basic.image_barrier_multiple

Signed-off-by: Tomeu Vizoso tomeu.vizoso@collabora.com