fn make_mir_scope<'ll, 'tcx>(
    cx: &CodegenCx<'ll, 'tcx>,
    instance: Instance<'tcx>,
    mir: &Body<'tcx>,
    variables: &Option<BitSet<SourceScope>>,
    debug_context: &mut FunctionDebugContext<&'ll DIScope, &'ll DILocation>,
    instantiated: &mut BitSet<SourceScope>,
    scope: SourceScope
)