[CUDA, test-suite] Disable testing of non-FP complex types.
According to the standard, instantiating of non-FP complex types is an
Non-FP complex types happen to work with libc++, libstdc++ 8 and older, but
break with libstdc++ 9 and newer due to the library not providing implicit
conversion std::complex<FP> ones.
Differential Revision: https://reviews.llvm.org/D97404