Integer accumulators and float accumulators do not occupy the same bits,
so the types cannot be arbitrarily changed.
No shader-db or fossil-db changes on any Intel platform.
v2: Use is_accumulator() instead if brw_reg_is_arf(). Add an extra test
to show the desired behavior when an accumulator is not
involved. Suggested by Caio.
Fixes: 64c251bb3a ("intel/fs: Combine constants for SEL instructions too")
Reviewed-by: Caio Oliveira <caio.oliveira@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/40638>
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