f1f05cc7cf
Because this pass is intended to be run after out-of-SSA and directly
before injesting the NIR into the back-end, it may come after divergence
analysis and needs to preserve the divergence information. Fortunately,
since all we ever do is insert nir_op_mov, this is easy.
Fixes: d313eba94e ("nir: Add pass for trivializing register access")
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/24153>