anchor.diff:    SsaCodeGenerator(
         this._codegenTask,
         this._options,
  +      this._metrics,
         this._emitter,
         this._rtiSubstitutions,
         this._rtiRecipeEncoder,
  
positive.code:           codeGenerator.parameters, codeGenerator.body);
      });
    }
  }
  
  class SsaCodeGenerator implements HVisitor, HBlockInformationVisitor {
  
negative.code:   final Tracer _tracer;
    final JClosedWorld _closedWorld;
    final CodegenRegistry _registry;
    final _CodegenMetrics _metrics;
  
    final Set<HInstruction> generateAtUseSite;
    final Set<HInstruction> controlFlowOperators;
  