Add more vfpu x86 jitting + somehow fix video issue

This makes #464 much better (still not right) in the x86 jit only.

But I don't know why.  Here's what I do know:

 * If vmov uses Comp_Generic, it's same as before.  Jit vmov is better.
 * If jit bails on prefixes, jit is still the same better, so it's not a prefix thing.
 * Bailing for all but V_Triple, jit is still the same better, so it's vmov.t that has the problem...

vmov maps directly to MOVSS in jit, so there's nothing funny there...  `GetVectorRegs()` and `ReadVector()` are a bit different, but I rewrote them more similar with no change.  `WriteVector()` uses the same logic, tried the same and no change.

So... I don't get it?  It can't be rounding, it's just a mov...

-[Unknown]