[clang] [TBAA] Emit int TBAA metadata on FP math libcalls (PR #96025)

[Eli Friedman via cfe-commits]

efriedma-quic wrote:

> > Can we restrict this to targets where libm actually modifies errno?
> 
> Do you mean it is better to have a function list, which actually modifies `errno` ? For example, we should restrict to `__exp10`, but but not a general top call `__exp `?

I said targets, not functions.  For example, MacOS never set errno for math functions.

https://github.com/llvm/llvm-project/pull/96025