Big merge from experimental to bleeding edge.

sdk/lib/_internal/compiler/implementation/js_backend/backend.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 js_backend;
 
 typedef void Recompile(Element element);
 
 class ReturnInfo {
   HType returnType;
@@ skipping 26 matching lines @@
   // Note that lazy initializers are treated like functions (but are not
   // of type [FunctionElement].
   addCompiledFunction(Element function) => compiledFunctions.add(function);
 }
 
 class OptionalParameterTypes {
   final List<SourceString> names;
   final List<HType> types;
 
   OptionalParameterTypes(int optionalArgumentsCount)
-      : names = new List<SourceString>(optionalArgumentsCount),
-        types = new List<HType>(optionalArgumentsCount);
+      : names = new List<SourceString>.fixedLength(optionalArgumentsCount),
+        types = new List<HType>.fixedLength(optionalArgumentsCount);
 
   int get length => names.length;
   SourceString name(int index) => names[index];
   HType type(int index) => types[index];
   int indexOf(SourceString name) => names.indexOf(name);
 
   HType typeFor(SourceString name) {
     int index = indexOf(name);
     if (index == -1) return null;
     return type(index);
   }
 
   void update(int index, SourceString name, HType type) {
     names[index] = name;
     types[index] = type;
   }
 
   String toString() => "OptionalParameterTypes($names, $types)";
 }
 
 class HTypeList {
   final List<HType> types;
   final List<SourceString> namedArguments;
 
   HTypeList(int length)
-      : types = new List<HType>(length),
+      : types = new List<HType>.fixedLength(length),
         namedArguments = null;
   HTypeList.withNamedArguments(int length, this.namedArguments)
-      : types = new List<HType>(length);
+      : types = new List<HType>.fixedLength(length);
   const HTypeList.withAllUnknown()
       : types = null,
         namedArguments = null;
 
   factory HTypeList.fromStaticInvocation(HInvokeStatic node, HTypeMap types) {
     bool allUnknown = true;
     for (int i = 1; i < node.inputs.length; i++) {
       if (types[node.inputs[i]] != HType.UNKNOWN) {
         allUnknown = false;
         break;
@@ skipping 1050 matching lines @@
     print("Inferred return types:");
     print("----------------------");
     dumpReturnTypes();
     print("");
     print("Inferred field types:");
     print("------------------------");
     fieldTypes.dump();
     print("");
   }
 }