radeonsi: reorder NIR passes in get_nir_shader (part 3)

Put passes that optimize the code first, and passes that lower it later.
This will be needed later.

Reviewed-by: Pierre-Eric Pelloux-Prayer <pierre-eric.pelloux-prayer@amd.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/32910>
1 file changed