aco/optimizer: propagate and fold inline constants on VOP3P instructions

This patch aims to propagate and fold constants on VOP3P instructions
by using omod selection and the fneg modifier.

Reviewed-by: Rhys Perry <pendingchaos02@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/13688>
1 file changed