message: Abort on invalid fft type or rank
diff: @@ -195,6 +195,9 @@ void EigenFftWithRank(const EigenDevice& device, void* out, void* operand,
  device, static_cast<float*>(out), static_cast<complex64*>(operand),
  input_batch, fft_length0, fft_length1, fft_length2);
  break;
  + default:
  + // Unsupported FFT type
  + abort();
  }
  }
  @@ -219,6 +222,9 @@ void EigenFftImpl(const EigenDevice& device, void* out, void* operand,
  input_batch, fft_length0,
  fft_length1, fft_length2);
  break;
  + default:
  + // Unsupported FFT rank
  + abort();
  }
  }
  