pub fn x86_supports(&self, feature: X86Feature) -> bool {
        match *self {
            TargetFeatures::X86(ref features) if features.contains(&feature) => true,
            _ => false,
        }
    }
Checks whether this `TargetFeatures` supports the given x86 feature.

Returns `false` if this is not an x86 target or the feature is not supported.
weld/src/codegen/llvm2/target.rs