Remove backend dependency from TypeTestRegistry

pkg/compiler/lib/src/js_emitter/code_emitter_task.dart

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library dart2js.js_emitter.code_emitter_task;
 
 import 'package:js_runtime/shared/embedded_names.dart' show JsBuiltin;
 
 import '../common.dart';
 import '../common/tasks.dart' show CompilerTask;
@@ skipping 130 matching lines @@
   /// The given type [e] might be a Typedef.
   jsAst.Expression typeAccess(Entity e) {
     return emitter.typeAccess(e);
   }
 
   /// Returns the JS template for the given [builtin].
   jsAst.Template builtinTemplateFor(JsBuiltin builtin) {
     return emitter.templateForBuiltin(builtin);
   }
 
-  Set<ClassEntity> _finalizeRti() {
+  void _finalizeRti() {
     // Compute the required type checks to know which classes need a
     // 'is$' method.
-    typeTestRegistry.computeRequiredTypeChecks();
+    typeTestRegistry.computeRequiredTypeChecks(backend.rtiChecksBuilder);
     // Compute the classes needed by RTI.
-    return typeTestRegistry.computeRtiNeededClasses();
+    typeTestRegistry.computeRtiNeededClasses(backend.rtiSubstitutions,
+        backend.mirrorsData, backend.generatedCode.keys);
   }
 
   /// Creates the [Emitter] for this task.
   void createEmitter(Namer namer, ClosedWorld closedWorld,
       CodegenWorldBuilder codegenWorldBuilder) {
     measure(() {
       _emitter = _emitterFactory.createEmitter(this, namer, closedWorld);
       metadataCollector = new MetadataCollector(
           compiler.options,
           compiler.reporter,
           compiler.deferredLoadTask,
           _emitter,
           backend.constants,
           backend.typeVariableCodegenAnalysis,
           backend.mirrorsData,
           backend.rtiEncoder);
-      typeTestRegistry = new TypeTestRegistry(
-          codegenWorldBuilder, compiler.backend, closedWorld);
+      typeTestRegistry = new TypeTestRegistry(codegenWorldBuilder, closedWorld);
     });
   }
 
   int assembleProgram(Namer namer, ClosedWorld closedWorld) {
     return measure(() {
-      Set<ClassEntity> rtiNeededClasses = _finalizeRti();
+      _finalizeRti();
       ProgramBuilder programBuilder = new ProgramBuilder(
           compiler.options,
           compiler.commonElements,
           compiler.types,
           compiler.deferredLoadTask,
           compiler.closureToClassMapper,
           compiler.codegenWorldBuilder,
           backend.nativeCodegenEnqueuer,
           backend.backendUsage,
           backend.constants,
           backend.nativeData,
           backend.rtiNeed,
           backend.mirrorsData,
           backend.interceptorData,
           backend.superMemberData,
-          backend.rtiChecks,
+          typeTestRegistry.rtiChecks,
           backend.rtiEncoder,
           backend.rtiSubstitutions,
           backend.jsInteropAnalysis,
           backend.oneShotInterceptorData,
           backend.customElementsCodegenAnalysis,
           backend.generatedCode,
           namer,
           this,
           closedWorld,
-          rtiNeededClasses,
+          typeTestRegistry.rtiNeededClasses,
           compiler.mainFunction,
           isMockCompilation: compiler.isMockCompilation);
       int size = emitter.emitProgram(programBuilder);
       // TODO(floitsch): we shouldn't need the `neededClasses` anymore.
       neededClasses = programBuilder.collector.neededClasses;
       return size;
     });
   }
 }
 
@@ skipping 54 matching lines @@
 
   /// Returns the JS code for accessing the given [constant].
   jsAst.Expression constantReference(ConstantValue constant);
 
   /// Returns the JS template for the given [builtin].
   jsAst.Template templateForBuiltin(JsBuiltin builtin);
 
   /// Returns the size of the code generated for a given output [unit].
   int generatedSize(OutputUnit unit);
 }