iobufprofiling使用问题

**Describe the bug**

stack_count_map;没有调用init函数
 struct BlockInfo {
        int64_t ref{0};
        StackCountMap stack_count_map;
    };


**To Reproduce**


**Expected behavior**


**Versions**
OS:
Compiler:
brpc:
protobuf:

**Additional context/screenshots**

