anchor.diff:    final Tracer _tracer;
     final JClosedWorld _closedWorld;
     final CodegenRegistry _registry;
  +  final _CodegenMetrics _metrics;
   
     final Set<HInstruction> generateAtUseSite;
     final Set<HInstruction> controlFlowOperators;
  
positive.code:       SsaCodeGenerator codeGenerator = SsaCodeGenerator(
            this,
            _options,
            emitter,
            codegen.rtiSubstitutions,
            codegen.rtiRecipeEncoder,
  
negative.code:   SsaCodeGenerator(
        this._codegenTask,
        this._options,
        this._metrics,
        this._emitter,
        this._rtiSubstitutions,
        this._rtiRecipeEncoder,
  