Support map and list literals in analyzer2dart.

tests/compiler/dart2js/backend_dart/sexpr_unstringifier.dart

 // Copyright (c) 2014, 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.
 
 // SExpressionUnstringifier implements the inverse operation to
 // [SExpressionStringifier].
 
 library sexpr_unstringifier;
 
 import 'package:compiler/implementation/constants/expressions.dart'
@@ skipping 641 matching lines @@
     return new LiteralList(null, values);
   }
 
   /// (LiteralMap keys values)
   LiteralMap parseLiteralMap() {
     tokens.consumeStart(LITERAL_MAP);
 
     List<Primitive> keys   = parsePrimitiveList();
     List<Primitive> values = parsePrimitiveList();
 
+    List<LiteralMapEntry> entries = <LiteralMapEntry>[];
+    for (int i = 0; i < keys.length; i++) {
+      entries.add(new LiteralMapEntry(keys[i], values[i]));
+    }
+
     tokens.consumeEnd();
-    return new LiteralMap(null, keys, values);
+    return new LiteralMap(null, entries);
   }
 
   /// (ReifyTypeVar type)
   ReifyTypeVar parseReifyTypeVar() {
     tokens.consumeStart(REIFY_TYPE_VAR);
 
     TypeVariableElement type = new DummyElement(tokens.read());
 
     tokens.consumeEnd();
     return new ReifyTypeVar(type);
   }
 
   /// (This)
   This parseThis() {
     tokens.consumeStart(THIS);
     tokens.consumeEnd();
     return new This();
   }
 }