Fix the locals lookup of variables and partial implementation of boxing of variables.

pkg/compiler/lib/src/js_model/js_strategy.dart

Index: pkg/compiler/lib/src/js_model/js_strategy.dart
diff --git a/pkg/compiler/lib/src/js_model/js_strategy.dart b/pkg/compiler/lib/src/js_model/js_strategy.dart
index cb118b74a483f96cf81c44424089c1774892bb2b..a526ba4c9f65599bfb7066fc4cd702b79d22cfd5 100644
--- a/pkg/compiler/lib/src/js_model/js_strategy.dart
+++ b/pkg/compiler/lib/src/js_model/js_strategy.dart
@@ -413,6 +413,7 @@ class JsClosedWorld extends ClosedWorldBase with KernelClosedWorldMixin {
       MemberEntity member,
       ir.FunctionNode originalClosureFunctionNode,
       JLibrary enclosingLibrary,
+      Set<JsCapturedScope> capturedScopes,
       KernelScopeInfo info,
       ir.Location location,
       KernelToLocalsMap localsMap) {
@@ -422,6 +423,7 @@ class JsClosedWorld extends ClosedWorldBase with KernelClosedWorldMixin {
         member,
         originalClosureFunctionNode,
         enclosingLibrary,
+        capturedScopes,
         info,
         location,
         localsMap,
@@ -431,15 +433,15 @@ class JsClosedWorld extends ClosedWorldBase with KernelClosedWorldMixin {
     // .getSupertypes(class)
     ClassHierarchyNode parentNode = getClassHierarchyNode(superclass);
     ClassHierarchyNode node = new ClassHierarchyNode(
-        parentNode, cls, getHierarchyDepth(superclass) + 1);
-    addClassHierarchyNode(cls, node);
+        parentNode, cls.closureClassEntity, getHierarchyDepth(superclass) + 1);
+    addClassHierarchyNode(cls.closureClassEntity, node);
     for (InterfaceType type in getOrderedTypeSet(superclass).types) {
       // TODO(efortuna): assert that the FunctionClass is in this ordered set.
       // If not, we need to explicitly add node as a subtype of FunctionClass.
       ClassSet subtypeSet = getClassSet(type.element);
       subtypeSet.addSubtype(node);
     }
-    addClassSet(cls, new ClassSet(node));
+    addClassSet(cls.closureClassEntity, new ClassSet(node));
     node.isDirectlyInstantiated = true;
 
     return cls;