[clang] [Clang] Add constexpr eval for cmath builtins (PR #194327)

[via cfe-commits]

Serosh-commits wrote:

@tbaederr i will update the interp__builtin_ceil to take BuiltinOp as a parameter to avoid the redundant call but have a question should we  apply this same change to all other math helpers ? 
or maybe just keep the parameter only for those which need these 

https://github.com/llvm/llvm-project/pull/194327