message: Disable some tests that are not applicable to poplar
diff: @@ -59,6 +59,7 @@ DynamicUpdateSliceTest.Int64R1 POPLAR // S64
  DynamicSliceTest.Int64R3 POPLAR // S64
  DynamicSliceTest.Int64R2 POPLAR // S64
  DynamicSliceTest.Int64R1 POPLAR // S64
  +ScalarComputationsTest.CastS64ToF32 POPLAR // S64
  ScalarComputationsTest.AddTwoScalarsU64 POPLAR // U64
  DynamicUpdateSliceTest.UInt64R3 POPLAR // U64
  @@ -84,6 +85,10 @@ ConvolutionTest.Convolve1D_1x2x5_1x2x2_Valid POPLAR // 1D conv
  ConvolutionTest.Convolve1D_Valid POPLAR // 1D conv
  ConvolutionVariantsTest.BackwardInputEvenPadding1D POPLAR // 1D conv
  ConvolutionVariantsTest.BackwardFilterEvenPadding1D POPLAR // 1D conv
  +ConvolutionTest.Convolve1D_1x2x5_1x2x2_WithPadding POPLAR // 1D conv
  +ConvolutionTest.Convolve1D_1x2x5_1x2x2_WithLHSAndRHSDilation POPLAR // 1D conv
  +ConvolutionTest.Convolve1D_1x2x5_1x2x2_WithRHSDilation POPLAR // 1D conv
  +ConvolutionTest.Convolve1D_1x2x5_1x2x2_WithLHSDilation POPLAR // 1D conv
  DotOperationTest POPLAR // Test hangs
  