message: [XLA] Consistently apply gpu-max-kernel-unroll-factor = 1 in HloTestBase.
  Previously we set it in CreateNewModule but not in
  GetDebugOptionsFromFlags(), which seems wrong.
diff: @@ -95,10 +95,7 @@ HloTestBase::HloTestBase(se::Platform* test_platform,
  /* static */
  std::unique_ptr<HloModule> HloTestBase::CreateNewModule(const string& name) {
  HloModuleConfig config;
  - auto debug_options = HloTestBase::GetDebugOptionsForTest();
  - debug_options.set_xla_gpu_max_kernel_unroll_factor(1);
  - config.set_debug_options(debug_options);
  -
  + config.set_debug_options(GetDebugOptionsForTest());
  return MakeUnique<HloModule>(name, VersionedComputationHandle(), config);
  }
  @@ -106,6 +103,7 @@ std::unique_ptr<HloModule> HloTestBase::CreateNewModule(const string& name) {
  auto debug_options = legacy_flags::GetDebugOptionsFromFlags();
  // TODO(b/38354253): Change tests to use Parameters instead of Constants.
  debug_options.add_xla_disable_hlo_passes("constant_folding");
  + debug_options.set_xla_gpu_max_kernel_unroll_factor(1);
  return debug_options;
  }
  