message: Fix convolution regression test's flag propagation. Previously it simply
  doesn't propagate XLA_FLAGS.
diff: @@ -25,8 +25,10 @@ class GpuConvolutionRegressionTest : public HloTestBase {
  // RunHloPasses goes through convolution autotuning, which performs
  // correctness cross-checking.
  void CheckForHloText(absl::string_view hlo_string) {
  + HloModuleConfig config;
  + config.set_debug_options(GetDebugOptionsFromFlags());
  (void)backend().compiler()->RunHloPasses(
  - ParseHloString(hlo_string, HloModuleConfig()).ConsumeValueOrDie(),
  + ParseHloString(hlo_string, config).ConsumeValueOrDie(),
  backend().default_stream_executor(), backend().memory_allocator());
  }
  };
  