message: [XLA] Speed up slice_test again.
  Previous patch missed one instance of creating a constant inside of
  slice_test.
diff: @@ -197,9 +197,10 @@ class SliceR1Test : public ClientLibraryTestBase,
  // vector<bool>.
  tensorflow::gtl::InlinedVector<NativeT, 1> input(spec.input_dim0);
  std::iota(input.begin(), input.end(), NativeT());
  + auto literal = Literal::CreateR1<NativeT>(input);
  XlaBuilder builder(TestName());
  - auto original = builder.ConstantR1<NativeT>(input);
  + auto original = builder.Parameter(0, literal->shape(), "p0");
  builder.Slice(original, {spec.slice_start}, {spec.slice_limit},
  {spec.slice_stride});
  @@ -210,7 +211,9 @@ class SliceR1Test : public ClientLibraryTestBase,
  expected.push_back(i);
  }
  - ComputeAndCompareR1<NativeT>(&builder, expected, {});
  + TF_ASSERT_OK_AND_ASSIGN(std::unique_ptr<GlobalData> arg,
  + client_->TransferToServer(*literal));
  + ComputeAndCompareR1<NativeT>(&builder, expected, {arg.get()});
  }
  };
  