[Bug target/88502] Inline built-in asinh, acosh, atanh for -ffast-math

[jsm28 at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88502

--- Comment #2 from Joseph S. Myers <jsm28 at gcc dot gnu.org> ---
I think flag_unsafe_math_optimizations is generally appropriate for these;
asinh needs flag_finite_math_only as well (because an Inf argument would result
in Inf / Inf) but neither of the others should.