Figure out what cr8 should do in AccessVpState

[cperezvargas]

AccessVpState stubs out cr8 read/writes. Figure out if/how we should wire this up. Supposedly it's only used for the instruction emulator, which doesn't need cr8.

These error tracing calls will be downgraded to trace. There's also updates to rflags in this path

[cperezvargas]

For CR8 @chris-oo thinks when we fix the instruction emulator to only grab state it needs, this goes away, but we need to confirm

[smalis-msft]

That work is happening in #482