ir3/cp: add option to disable immediate to const lowering

This will allow it to be used after ir3_imm_const_to_preamble so that we
don't have to do the propagation of immediates manually there.

Signed-off-by: Job Noorman <jnoorman@igalia.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/34397>
3 files changed