Assume prefixes start as default until proven wrong

You meant like this, right?

Right now, since it doesn't have many flags, it'll blow the cache once the first time it hits a vfpu op.  The ones I've set flags on I've all tested to make sure they actually do/don't take prefixes.

It won't blow the cache if it hits (vfpu without flag) -> vmov.q -> branch, because the vmov will eat prefixes.  Now it's just a matter of marking the rest and implementing more.

-[Unknown]