Function align_size

dnn/src/common/cv/helper.h:92–95

using AlignedVector = std::vector<T, ah::aligned_allocator<T, 16>>;

static inline size_t align_size(size_t sz, int n) {
    megdnn_assert((n & (n - 1)) == 0);
    return (sz + n - 1) & -n;
}

static inline int clip(int x, int a, int b) {
    return x >= a ? (x < b ? x : b - 1) : a;