[clang] [clang] Lower non-builtin sincos[f|l] calls to llvm.sincos.* when -fno-math-errno is set (PR #121763)

[Sander de Smalen via cfe-commits]

https://github.com/sdesmalen-arm commented:

@RKSimon do you know if there is a reason CodeGen AA is not enabled for x86?

I'd otherwise be happy to approve this patch, lowering to the intrinsic seems like the right thing to do.

https://github.com/llvm/llvm-project/pull/121763