First of all MENT doesn't have much cash. Nor can it get financing without taking a HUGE debt. LAVA market cap is at $328M (as of today). So it will have to be either CDNS or SNPS taking over LAVA. It won't be MENT.
As for MENT take over, that has a high probability. EDA industry needs a big shift. And it will come from consolidation at the top (SNPS, CDNS, MENT, LAVA).
My bet is on MENT being acquired by either SNPS or CDNS. Then one of them will acquire LAVA.
Both SNPS and CDNS can acquire MENT and LAVA. They have cash and much higher market caps. And will be easy to get financing.