The override used for the immed encoding in #cat3-src-const-or-immed
used a pattern which isn't supported in overrides by isaspec. The
pattern in the base bitset (10) was too strict for immediates since it
didn't allow the most significant bit to be 1.
Fix this by making the base pattern 1 and adding an assert for the next
bit to be 0 in the non-immed case.
Signed-off-by: Job Noorman <jnoorman@igalia.com>
Fixes: 1c6c200c0d ("ir3: add newly found shlg.b16 instruction")
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/32549>
Job Noorman
943f666b69