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

[Benjamin Maxwell via cfe-commits]

MacDue wrote:

> I'm a hard no on making this a target dependent option. Just enable it unconditionally and take the regression

Fine, I don't mind the regression as it does not affect targets I work on, I just wanted to make the changes needed for AArch64 without knowingly slightly regressing other targets. 

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