Function encode_with_shorthand

pub fn encode_with_shorthand<'tcx, E, T, M>(
    encoder: &mut E,
    value: &T,
    cache: M,
)
where
    E: TyEncoder<I = TyCtxt<'tcx>>,
    M: for<'b> Fn(&'b mut E) -> &'b mut FxHashMap<T, usize>,
    T: EncodableWithShorthand<E>,
    T::Variant: DiscriminantKind<Discriminant = isize>,

Encode the given value or a previously cached shorthand.