Add DartType.treatAsRaw to treat List<dynamic> as List in the backend.

sdk/lib/_internal/compiler/implementation/compile_time_constants.dart

 // Copyright (c) 2012, 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.
 
 part of dart2js;
 
 /**
  * The [ConstantHandler] keeps track of compile-time constants,
  * initializations of global and static fields, and default values of
  * optional parameters.
@@ skipping 47 matching lines @@
     compiledConstants.add(constant);
   }
 
   void registerInstantiatedType(DartType type, TreeElements elements) {
     if (isMetadata) {
       compiler.backend.registerMetadataInstantiatedType(type, elements);
       return;
     }
     compiler.enqueuer.codegen.registerInstantiatedType(type, elements);
     if (type is InterfaceType &&
-        !type.isRaw &&
+        !type.treatAsRaw &&
         compiler.backend.classNeedsRti(type.element)) {
       registerSetRuntimeTypeInfoFunction();
     }
   }
 
   void registerStaticUse(Element element) {
     if (isMetadata) {
       compiler.backend.registerMetadataStaticUse(element);
       return;
     }
@@ skipping 336 matching lines @@
         onlyStringKeys = false;
         // Don't handle __proto__ values specially in the general map case.
         protoValue = null;
         break;
       }
     }
 
     bool hasProtoKey = (protoValue != null);
     List<Constant> values = map.values.toList();
     InterfaceType sourceType = elements.getType(node);
-    Link<DartType> arguments =
-        new Link<DartType>.fromList([compiler.stringClass.rawType]);
-    DartType keysType = new InterfaceType(compiler.listClass, arguments);
+    DartType keysType;
+    if (sourceType.treatAsRaw) {
+      keysType = compiler.listClass.rawType;
+    } else {
+      Link<DartType> arguments =
+          new Link<DartType>.fromList([sourceType.typeArguments.head]);
+      keysType = new InterfaceType(compiler.listClass, arguments);
+    }
     ListConstant keysList = new ListConstant(keysType, keys);
     if (onlyStringKeys) {
       handler.registerCompileTimeConstant(keysList, elements);
     }
     SourceString className = onlyStringKeys
         ? (hasProtoKey ? MapConstant.DART_PROTO_CLASS
                        : MapConstant.DART_STRING_CLASS)
         : MapConstant.DART_GENERAL_CLASS;
     ClassElement classElement = compiler.jsHelperLibrary.find(className);
     classElement.ensureResolved(compiler);
     Link<DartType> typeArgument = sourceType.typeArguments;
-    InterfaceType type = new InterfaceType(classElement, typeArgument);
-    handler.registerInstantiatedType(type, elements);
+    InterfaceType type;
+    if (sourceType.treatAsRaw) {
+      type = classElement.rawType;
+    } else {
+      type = new InterfaceType(classElement, typeArgument);
+    }
     Constant constant =
         new MapConstant(type, keysList, values, protoValue, onlyStringKeys);
     handler.registerCompileTimeConstant(constant, elements);
     return constant;
   }
 
   Constant visitLiteralNull(LiteralNull node) {
     return constantSystem.createNull();
   }
 
@@ skipping 517 matching lines @@
           if (fieldValue == null) {
             // Use the default value.
             fieldValue = handler.compileConstant(field);
           }
           jsNewArguments.add(fieldValue);
         },
         includeSuperAndInjectedMembers: true);
     return jsNewArguments;
   }
 }