add_range_with_merge
nr_range = add_range_with_merge(range, RANGE_NUM, nr_range,
nr_range = add_range_with_merge(range, RANGE_NUM, 0, 0,
nr_pfn_mapped = add_range_with_merge(pfn_mapped, E820_MAX_ENTRIES,
int add_range_with_merge(struct range *range, int az, int nr_range,