message: Make MLIR TF2XLA bridge to run in a FallbackEnabled mode if graph is compatible with the analysis by default.
diff: @@ -102,7 +102,7 @@ MlirOptimizationPassState MlirBridgePass::GetPassState(
  case MlirBridgeRolloutPolicy::kEnabledByUser:
  return MlirOptimizationPassState::Enabled;
  case MlirBridgeRolloutPolicy::kEnabledAfterGraphAnalysis:
  - return MlirOptimizationPassState::ShadowEnabled;
  + return MlirOptimizationPassState::FallbackEnabled;
  case MlirBridgeRolloutPolicy::kEnabledAfterGraphAnalysisSafeModeFallback:
  return MlirOptimizationPassState::FallbackEnabled;
  case MlirBridgeRolloutPolicy::kDisabledByUser:
  @@ -181,6 +181,7 @@ MlirOptimizationPassState MlirBridgeV1CompatPass::GetPassState(
  case MlirBridgeRolloutPolicy::kEnabledAfterGraphAnalysisSafeModeFallback:
  return MlirOptimizationPassState::FallbackEnabled;
  case MlirBridgeRolloutPolicy::kEnabledAfterGraphAnalysis:
  + return MlirOptimizationPassState::FallbackEnabled;
  case MlirBridgeRolloutPolicy::kDisabledByUser:
  case MlirBridgeRolloutPolicy::kDisabledAfterGraphAnalysis:
  return MlirOptimizationPassState::Disabled;
  