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

[Hrólf Kraki via cfe-commits]

Serosh-commits wrote:

The build is failing due to PR #213750 which renamed `checkFloatingPointResult` 
to `checkFloatingPointResultForConstantFolding`.  i will fix it soon


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