[clang] [llvm] [InstCombine] Combine llvm.sin/llvm.cos libcall pairs into llvm.sincos (PR #184760)

[Kito Cheng via cfe-commits]

kito-cheng wrote:

I plan gonna to moving this forward and create another PRs as follow up for fixing libmvec and AMDLIBM.

https://github.com/llvm/llvm-project/pull/184760