Extract the AST specific part of NoSuchMethodRegistry

pkg/compiler/lib/src/js_backend/backend.dart

Index: pkg/compiler/lib/src/js_backend/backend.dart
diff --git a/pkg/compiler/lib/src/js_backend/backend.dart b/pkg/compiler/lib/src/js_backend/backend.dart
index e9b29b94460b317ae358562241d412cfa2d6b171..76e42015c8f2f8f809b758f395763d2f92d06edc 100644
--- a/pkg/compiler/lib/src/js_backend/backend.dart
+++ b/pkg/compiler/lib/src/js_backend/backend.dart
@@ -520,7 +520,8 @@ class JavaScriptBackend {
     lookupMapResolutionAnalysis =
         new LookupMapResolutionAnalysis(reporter, compiler.elementEnvironment);
 
-    noSuchMethodRegistry = new NoSuchMethodRegistry(this);
+    noSuchMethodRegistry =
+        new NoSuchMethodRegistry(helpers, new NoSuchMethodResolverImpl());
     kernelTask = new KernelTask(compiler);
     patchResolverTask = new PatchResolverTask(compiler);
     functionCompiler =
@@ -681,10 +682,6 @@ class JavaScriptBackend {
     return constantCompilerTask.jsConstantCompiler;
   }
 
-  bool isDefaultNoSuchMethod(MethodElement element) {
-    return noSuchMethodRegistry.isDefaultNoSuchMethodImplementation(element);
-  }
-
   MethodElement resolveExternalFunction(MethodElement element) {
     if (isForeign(element)) {
       return element;
@@ -805,16 +802,8 @@ class JavaScriptBackend {
     mirrorsResolutionAnalysis.onResolutionComplete();
   }
 
-  void onTypeInferenceComplete() {
-    noSuchMethodRegistry.onTypeInferenceComplete();
-  }
-
-  /// Register a runtime type variable bound tests between [typeArgument] and
-  /// [bound].
-  void registerTypeVariableBoundsSubtypeCheck(
-      ResolutionDartType typeArgument, ResolutionDartType bound) {
-    rtiChecksBuilder.registerTypeVariableBoundsSubtypeCheck(
-        typeArgument, bound);
+  void onTypeInferenceComplete(GlobalTypeInferenceResults results) {
+    noSuchMethodRegistry.onTypeInferenceComplete(results);
   }
 
   /// Returns the [WorldImpact] of enabling deferred loading.
@@ -855,9 +844,6 @@ class JavaScriptBackend {
     return null;
   }
 
-  bool isComplexNoSuchMethod(FunctionElement element) =>
-      noSuchMethodRegistry.isComplex(element);
-
   ResolutionEnqueuer createResolutionEnqueuer(
       CompilerTask task, Compiler compiler) {
     _nativeBasicData =
@@ -1069,7 +1055,7 @@ class JavaScriptBackend {
   /// Generates the output and returns the total size of the generated code.
   int assembleProgram(ClosedWorld closedWorld) {
     int programSize = emitter.assembleProgram(namer, closedWorld);
-    noSuchMethodRegistry.emitDiagnostic();
+    noSuchMethodRegistry.emitDiagnostic(reporter);
     int totalMethodCount = generatedCode.length;
     if (totalMethodCount != mirrorsCodegenAnalysis.preMirrorsMethodCount) {
       int mirrorCount =
@@ -1578,7 +1564,7 @@ class JavaScriptBackendTarget extends Target {
 
   @override
   bool isDefaultNoSuchMethod(MethodElement element) {
-    return _backend.isDefaultNoSuchMethod(element);
+    return _backend.helpers.isDefaultNoSuchMethodImplementation(element);
   }
 
   @override