this was missed in typical testing because either tests run with all
features, no features, or fmt. there wasn't a test entry for only std,
which was broken.

this is backed by the new IsaSettings trait. the existing InstDecoders
are unchanged, except that they implement this new trait.

also add new `DecodeEverything` structs with `IsaSettings` impls that
are unconditionally set to permit anything the decoder can be configured
to conditionally accept or reject.

in the process, add new `_3dnow` flag and stop accepting 3dnow
instructions in uarch-specific decoder settings that would not have
3dnow instructions.

update AMD microarchitectures and cross-ref chip directory

fix 32-bit 66-prefixed ff /2 call not having 16-bit operands

fix momentary regression in rendering `call` instructions to string