x86: IAMCU, L1OM, and K1OM

[Jan Beulich]

H.J.,

may I ask what the status / purpose of these is? They were added years
ago, but actually useful functionality has never appeared. Since I've
noticed a couple of issues with the involved gas code, I'm now
wondering: Should I try to make fixes, or can the logic rather be
purged altogether? Even if the overhead isn't high, the presence of
support for these not really usable sub-architectures is causing some
extra cycles to be wasted on each and every gas invocation.

Thanks for any insight into possible plans here,
Jan