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104f3c1806
`std::complex` operators do not work for the CUDA device compilation of F18 runtime. This change makes use of `cuda::std::complex` from `libcudacxx`. `cuda::std::complex` does not have specializations for `long double`, so the change is accompanied with a clean-up for `long double` usage. Additional change on top of #109078 is to use `cuda::std::complex` only for the device compilation, otherwise the host compilation fails because `libcudacxx` may not support `long double` specialization at all (depending on the compiler).