Function rustc_mir::monomorphize::partitioning::collect_and_partition_mono_items

pub(in monomorphize::partitioning) fn collect_and_partition_mono_items<'tcx>(
    tcx: TyCtxt<'tcx>, 
    cnum: CrateNum
) -> (&'tcx DefIdSet, &'tcx [CodegenUnit<'tcx>])