message: Fix unittest input values.
  The test meant to use int64 value as the input for tensor but passed int8 instead.
  The change fixes the issue.
diff: @@ -58,11 +58,11 @@ TEST(FillOpModel, FillInt32) {
  TEST(FillOpModel, FillInt64) {
  FillOpModel m({TensorType_INT32, {2}}, {TensorType_INT64});
  m.PopulateTensor<int32_t>(m.input1(), {2, 4});
  - m.PopulateTensor<int64_t>(m.input2(), {2 ^ 45});
  + m.PopulateTensor<int64_t>(m.input2(), {1LL << 45});
  m.Invoke();
  EXPECT_THAT(m.ExtractVector<int64_t>(m.output()),
  - ElementsAreArray({2 ^ 45, 2 ^ 45, 2 ^ 45, 2 ^ 45, 2 ^ 45, 2 ^ 45,
  - 2 ^ 45, 2 ^ 45}));
  + ElementsAreArray({1LL << 45, 1LL << 45, 1LL << 45, 1LL << 45,
  + 1LL << 45, 1LL << 45, 1LL << 45, 1LL << 45}));
  EXPECT_THAT(m.GetTensorShape(m.output()), ElementsAreArray({2, 4}));
  }
  