aco: fix f2i64/f2u64 with sgprs if the exponent computation overflow

This fixes f16->{i64,u64} conversions for +0/-0.

Signed-off-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Reviewed-by: Daniel Schürmann <daniel@schuermann.dev>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4509>
1 file changed