Return true if comparing t_TYPE1 and t_TYPE2 with synth-three-way is noexcept.
Declared in <bslalg_synththreewayutil.h>
template<
class t_TYPE1,
class t_TYPE2>
constexpr
static
bool
isNoexcept(
t_TYPE1 const* t1 = nullptr,
t_TYPE2 const* t2 = nullptr);