Method RoundUp

tensorflow/core/common_runtime/pool_allocator.h:144–146

class Pow2Rounder : public RoundUpInterface {
 public:
  size_t RoundUp(size_t num_bytes) override {
    return 1uLL << Log2Ceiling64(num_bytes);
  }
};

class BasicCPUAllocator : public SubAllocator {