pub fn v3_feature_words() -> Vec<(u32, u32, usize, u32)>Expand description
The feature words the x86-64-v3 table advertises, as (leaf, subleaf, register, bits) with registers 0-3 for EAX-EDX, for the CLI’s check that
the host has every one of them natively
(https://github.com/rrnewton/hermit/issues/4243). Leaf 0xD, which comes
from the host, is not among them.