convert llvm intrinsics to nvvm libdevice

[zhangzhimin]

1. convert like as "llvm.sin.f32" intrinsics to __nv_sinf
2. write some unit test

https://llvm.org/docs/LangRef.html#standard-c-c-library-intrinsics https://docs.nvidia.com/cuda/libdevice-users-guide/index.html

@haobosang