Lower map literals to constructor or function calls in builder

pkg/compiler/lib/src/js_backend/codegen/codegen.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.
 
 library code_generator;
 
 import 'glue.dart';
 
 import '../../closure.dart' show
     ClosureClassElement;
@@ skipping 352 matching lines @@
   }
 
   @override
   js.Expression visitLiteralList(tree_ir.LiteralList node) {
     registry.registerInstantiatedClass(glue.listClass);
     List<js.Expression> entries = visitExpressionList(node.values);
     return new js.ArrayInitializer(entries);
   }
 
   @override
-  js.Expression visitLiteralMap(tree_ir.LiteralMap node) {
-    ConstructorElement constructor;
-    if (node.entries.isEmpty) {
-      constructor = glue.mapLiteralConstructorEmpty;
-    } else {
-      constructor = glue.mapLiteralConstructor;
-    }
-    List<js.Expression> entries =
-        new List<js.Expression>(2 * node.entries.length);
-    for (int i = 0; i < node.entries.length; i++) {
-      entries[2 * i] = visitExpression(node.entries[i].key);
-      entries[2 * i + 1] = visitExpression(node.entries[i].value);
-    }
-    List<js.Expression> args = entries.isEmpty
-         ? <js.Expression>[]
-         : <js.Expression>[new js.ArrayInitializer(entries)];
-    return buildStaticInvoke(constructor, args);
-  }
-
-  @override
   js.Expression visitLogicalOperator(tree_ir.LogicalOperator node) {
     return new js.Binary(
         node.operator,
         visitExpression(node.left),
         visitExpression(node.right));
   }
 
   @override
   js.Expression visitNot(tree_ir.Not node) {
     return new js.Prefix("!", visitExpression(node.operand));
@@ skipping 834 matching lines @@
   void registerDefaultParameterValues(ExecutableElement element) {
     if (element is! FunctionElement) return;
     FunctionElement function = element;
     if (function.isStatic) return; // Defaults are inlined at call sites.
     function.functionSignature.forEachOptionalParameter((param) {
       ConstantValue constant = glue.getDefaultParameterValue(param);
       registry.registerCompileTimeConstant(constant);
     });
   }
 }