Add ScopeInfo class for variable information that doesn't actually involve closures.

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

 // Copyright (c) 2016, 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.
 
 import 'package:kernel/ast.dart' as ir;
 
 import '../closure.dart';
 import '../common/tasks.dart';
 import '../elements/entities.dart';
 import '../world.dart';
@@ skipping 79 matching lines @@
       ClosedWorldRefiner closedWorldRefiner) {
     // TODO(efortuna): implement.
   }
 
   /// TODO(johnniwinther,efortuna): Implement this.
   @override
   ClosureAnalysisInfo getClosureAnalysisInfo(ir.Node node) {
     return const ClosureAnalysisInfo();
   }
 
+  @override
+  ScopeInfo getScopeInfo(Entity entity) {
+    // TODO(efortuna): Specialize this function from the one below.
+    return getClosureRepresentationInfo(entity);
+  }
+
   /// TODO(johnniwinther,efortuna): Implement this.
   @override
   LoopClosureRepresentationInfo getClosureRepresentationInfoForLoop(
       ir.Node loopNode) {
     return const LoopClosureRepresentationInfo();
   }
 
   @override
   ClosureRepresentationInfo getClosureRepresentationInfo(Entity entity) {
     return _infoMap.putIfAbsent(entity, () {
@@ skipping 30 matching lines @@
   bool variableIsUsedInTryOrSync(Local variable) =>
       _localsUsedInTryOrSync.contains(variable);
 
   String toString() {
     StringBuffer sb = new StringBuffer();
     sb.write('this=$thisLocal,');
     sb.write('localsUsedInTryOrSync={${_localsUsedInTryOrSync.join(', ')}}');
     return sb.toString();
   }
 }