Function fn_abi_new_uncached

fn fn_abi_new_uncached<'tcx>(
    cx: &LayoutCx<'tcx>,
    sig: FnSig<'tcx>,
    extra_args: &[Ty<'tcx>],
    instance: Option<Instance<'tcx>>,
) -> Result<&'tcx FnAbi<'tcx, Ty<'tcx>>, &'tcx FnAbiError<'tcx>>