[libcxx-commits] [libcxx] [libc++][math] Add `constexpr` to classification / comparison functions (PR #210075)

[Lucas Mellone via libcxx-commits]

lknknm wrote:

@philnik777 / @frederick-vs-ja 
Please check, all `is<...>` are implemented. 
I'm not sure if all the test cases are correct and covering all possible scenarios, could you please take a look?
Thanks!

https://github.com/llvm/llvm-project/pull/210075