Simplify cosh(x) / sinh(x) -> 1/tanh(x) with fast math

[felixkellenbenz]

When using sin(x) and cos(x) the optimization for cos(x) / sin(x) -> 1/tan(x) is already implemented. This is not the case for the hyperbolic functions, maybe it would be good to also implement this behavior for sinh(x) and cos(x).
However this is not how gcc behaves, gcc calculates it like cosh(x) / sinh(x).

See here:
https://godbolt.org/z/vrMTP3h9x

[felixkellenbenz]

I am currently working on #78871. I could fix this issue too. Should I create separate pull request for this issue and #78871 or is it fine if I include a fix for both issues in one PR.