Add KernelNativeBehaviorComputer

pkg/compiler/lib/src/kernel/elements.dart

 // Copyright (c) 2017, 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.
 
 /// Entity model for elements derived from Kernel IR.
 
 import '../elements/elements.dart';
 import '../elements/entities.dart';
 
 class KLibrary implements LibraryEntity {
@@ skipping 61 matching lines @@
   String toString() =>
       '$_kind(${enclosingClass != null ? '${enclosingClass.name}.' : ''}$name)';
 }
 
 abstract class KFunction extends KMember implements FunctionEntity {
   KFunction(KClass enclosingClass, Name name, {bool isStatic: false})
       : super(enclosingClass, name, isStatic: isStatic);
 }
 
 abstract class KConstructor extends KFunction implements ConstructorEntity {
-  KConstructor(KClass enclosingClass, Name name) : super(enclosingClass, name);
+  /// Constructor index used for fast lookup in [KernelWorldBuilder].
+  final int constructorIndex;
+
+  KConstructor(this.constructorIndex, KClass enclosingClass, Name name)
+      : super(enclosingClass, name);
 
   @override
   bool get isConstructor => true;
 
   @override
   bool get isInstanceMember => false;
 
   @override
   bool get isStatic => false;
 
   @override
   bool get isTopLevel => false;
 
   String get _kind => 'constructor';
 }
 
 class KGenerativeConstructor extends KConstructor {
-  KGenerativeConstructor(KClass enclosingClass, Name name)
-      : super(enclosingClass, name);
+  KGenerativeConstructor(int constructorIndex, KClass enclosingClass, Name name)
+      : super(constructorIndex, enclosingClass, name);
 
   @override
   bool get isFactoryConstructor => false;
 
   @override
   bool get isGenerativeConstructor => true;
 }
 
 class KFactoryConstructor extends KConstructor {
-  KFactoryConstructor(KClass enclosingClass, Name name)
-      : super(enclosingClass, name);
+  KFactoryConstructor(int constructorIndex, KClass enclosingClass, Name name)
+      : super(constructorIndex, enclosingClass, name);
 
   @override
   bool get isFactoryConstructor => true;
 
   @override
   bool get isGenerativeConstructor => false;
 }
 
 class KMethod extends KFunction {
   KMethod(KClass enclosingClass, Name name, {bool isStatic})
@@ skipping 53 matching lines @@
 class KLocalFunction implements Local {
   final String name;
   final MemberEntity memberContext;
   final Entity executableContext;
 
   KLocalFunction(this.name, this.memberContext, this.executableContext);
 
   String toString() =>
       'local_function(${memberContext.name}.${name ?? '<anonymous>'})';
 }