anchor.diff:    final Tracer _tracer;
     final JClosedWorld _closedWorld;
     final CodegenRegistry _registry;
  +  final _CodegenMetrics _metrics;
   
     final Set<HInstruction> generateAtUseSite;
     final Set<HInstruction> controlFlowOperators;
  
positive.code: 
    @override
    String get name => 'SSA code generator';
  
    js.Fun buildJavaScriptFunction(bool needsAsyncRewrite, FunctionEntity element,
        List<js.Parameter> parameters, js.Block body) {
  
negative.code:       SsaCodeGenerator codeGenerator = SsaCodeGenerator(
            this,
            _options,
            _metrics,
            emitter,
            codegen.rtiSubstitutions,
            codegen.rtiRecipeEncoder,
  