fn fn_abi_new_uncached<'tcx>(
cx: &LayoutCx<'tcx>,
sig: PolyFnSig<'tcx>,
extra_args: &[Ty<'tcx>],
caller_location: Option<Ty<'tcx>>,
fn_def_id: Option<DefId>,
force_thin_self_ptr: bool,
) -> Result<&'tcx FnAbi<'tcx, Ty<'tcx>>, &'tcx FnAbiError<'tcx>>