[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've pushed a change to restrict this to AArch64 (other targets could enable it too) given no reply above, or progress on https://github.com/llvm/llvm-project/pull/123787.

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