7223bcf04c
This patch adds constexpr to <complex> header: operators, member operators, and member functions (real, imag, norm, conj). https://eel.is/c++draft/complex.numbers https://wg21.link/p0415 Reviewed By: ldionne, #libc Spies: philnik, danilaml, Quuxplusone, wmaxey, arichardson, libcxx-commits Differential Revision: https://reviews.llvm.org/D79555