JSInvocationMirror - return unmodifiable list or map

sdk/lib/_internal/compiler/js_lib/js_helper.dart

Index: sdk/lib/_internal/compiler/js_lib/js_helper.dart
diff --git a/sdk/lib/_internal/compiler/js_lib/js_helper.dart b/sdk/lib/_internal/compiler/js_lib/js_helper.dart
index 4270ab576d2e43084f28ac99258d89c433f6be9a..ca53762e2c5d540d72f762d14fbd263e2c81d9dc 100644
--- a/sdk/lib/_internal/compiler/js_lib/js_helper.dart
+++ b/sdk/lib/_internal/compiler/js_lib/js_helper.dart
@@ -300,21 +300,20 @@ class JSInvocationMirror implements Invocation {
     for (var index = 0 ; index < argumentCount ; index++) {
       list.add(_arguments[index]);
     }
-    return makeLiteralListConst(list);
+    return JSArray.markUnmodifiableList(list);
   }
 
   Map<Symbol, dynamic> get namedArguments {
-    // TODO: Make maps const (issue 10471)
-    if (isAccessor) return <Symbol, dynamic>{};
+    if (isAccessor) return const <Symbol, dynamic>{};
     int namedArgumentCount = _namedArgumentNames.length;
     int namedArgumentsStartIndex = _arguments.length - namedArgumentCount;
-    if (namedArgumentCount == 0) return <Symbol, dynamic>{};
+    if (namedArgumentCount == 0) return const <Symbol, dynamic>{};
     var map = new Map<Symbol, dynamic>();
     for (int i = 0; i < namedArgumentCount; i++) {
       map[new _symbol_dev.Symbol.unvalidated(_namedArgumentNames[i])] =
           _arguments[namedArgumentsStartIndex + i];
     }
-    return map;
+    return new ConstantMapView<Symbol, dynamic>(map);
   }
 
   _getCachedInvocation(Object object) {
@@ -1505,12 +1504,6 @@ throwExpression(ex) {
   JS('void', 'throw #', wrapException(ex));
 }
 
-makeLiteralListConst(list) {
-  JS('bool', r'#.immutable$list = #', list, true);
-  JS('bool', r'#.fixed$length = #', list, true);
-  return list;
-}
-
 throwRuntimeError(message) {
   throw new RuntimeError(message);
 }