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

[Simon Pilgrim via cfe-commits]

RKSimon wrote:

> @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.

I don't remember any reason for alias analysis to not be enabled on x86 - @phoebewang @topperc do you know?

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