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

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vfdff 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 `?
https://github.com/lattera/glibc/blob/895ef79e04a953cac1493863bcae29ad85657ee1/math/w_exp10_template.c#L35

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