Support brpc for PPC64 by HX

[yjloong]

Is your feature request related to a problem? (你需要的功能是否与某个问题有关?)
Support brpc for PPC64

Describe the solution you'd like (描述你期望的解决方法)
Add some arch code.

Describe alternatives you've considered (描述你想到的折衷方案)
The uploaded code is more used to record for the question.
brpc-ppc64-build-fix.patch

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

[yjloong]

The patch deletes some parts of performance. If performance is needed, main works will be done in neo2sse.c.

[lorinlee]

Hi @yjloong , thanks for your contribution, could you please consider opening a Pull Request?