move f16/f128 const fn under f16/f128 feature gate The `*_const` features were added to work around https://github.com/rust-lang/rust/issues/129656, which should not be needed any more.
move f16/f128 const fn under f16/f128 feature gate The `*_const` features were added to work around https://github.com/rust-lang/rust/issues/129656, which should not be needed any more.