Porting/ncnn

Finished

• Translate x86_64 SSE to ppc64le VSX intrinsics
• VSX toolchains: check for SSE2 support
• Add POWER8 VSX toolchains
• load_param_mem pybind

In progress

• CI missing for POWER9/Clang
• SSE4.1 missing for POWER9/Clang on Fedora 38
  • Caused by LLVM issue 64664
• Replace SSE with native VSX

See Also

• chaiNNer
• ONNX
• PyTorch