brpc使用clang编译时,运行example/streaming_echo_c++会出现core dump

**Describe the bug (描述bug)**
brpc使用clang编译时,运行example/streaming_echo_c++会出现core dump

**To Reproduce (复现方法)**
编译brpc:
`mkdir build && cd build
export CXX=clang++
cmake .. -G Ninja && ninja
`
编译/example/streaming_echo_c++
`mkdir build && cd build
cmake .. -G Ninja && ninja `

**Expected behavior (期望行为)**
程序正常运行

**Versions (各种版本)**
OS: ubuntu
Compiler: Ubuntu clang version 15.0.7
brpc: 1.10.0及以上版本
protobuf:

**Additional context/screenshots (更多上下文/截图)**

Start by building brpc and example/streaming_echo_c++ with CMake, Ninja, and Ubuntu clang 15.0.7 as described, then reproduce the core dump and capture the crash location and stack trace; compare the runtime behavior with another compiler if useful. Done means the example runs normally without a core dump when built with clang.

Written by the indexing model from the issue text.