aco: Unset 16 and 24-bit flags from operands in apply_extract.

aco: Unset 16 and 24-bit flags from operands in apply_extract.

Consider the following sequence in a shader:
b = p_extract a
c = v_mad_u32_u16 b, X, 0

The optimizer applies extract, resulting in:
c = v_mad_u32_u16 a, X, 0 (correct)

Then it mistakenly turns that into:
c = v_mul_u32_u24 a, X, 0 (incorrect)

In this case, the p_extract is applied to v_mad_u32_u16 by
apply_extract. After this, we can no longer be sure that
the operands are still 16 or 24-bit, so we have to remove
this flag.

No Fossil DB changes.

Fixes: 54292e99c7844500314bfd623469c65adef954c5
Signed-off-by: Timur Kristóf <timur.kristof@gmail.com>
Reviewed-by: Rhys Perry <pendingchaos02@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/12558>