Created by: liu-plus-wei

1. accelerate the buddy_allocator efficiency by reducing the query times of unordered_map
2. disable update_guards and check_guards in release mode

test set: base line 3373 alloc/free command * 5000 loops : 17.316s

change 1: 17.316s => 7.735s change 2: 7.735s => 5.198s