We want to have two distinct control knobs here. CPU features that don't
change between Linux, Wow64, Arm64ec, and additional options that change
depending on the process environment.
This distinction was a /bit/ muddy where I added
`SupportsFaultFreeSynchronousFaults` to the wrong side of that. Make it
more distinct by logically splitting it out so that HostType, the
fault-free-faults, and added Is64BitMode all lives together.
This lets the DiskCache code which is hashing these variables look a bit
nicer and also correctly logically separate the two halves.
Ryan Houdek
cbcb003425