Improve List implementation.

dart/frog/leg/ssa/nodes.dart

 // Copyright (c) 2011, 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.
 
 interface HVisitor<R> {
   R visitAdd(HAdd node);
   R visitBailoutTarget(HBailoutTarget node);
   R visitBitAnd(HBitAnd node);
   R visitBitNot(HBitNot node);
   R visitBitOr(HBitOr node);
@@ skipping 1073 matching lines @@
 
   HInvokeInterceptor(Selector selector,
                      SourceString this.name,
                      bool this.getter,
                      List<HInstruction> inputs)
       : super(selector, inputs);
   toString() => 'invoke interceptor: ${element.name}';
   accept(HVisitor visitor) => visitor.visitInvokeInterceptor(this);
 
   HType computeType() {
-    if (name == const SourceString('length') && inputs[1].isStringOrArray()) {
+    if (getter && name == const SourceString('length')
+        && inputs[1].isStringOrArray()) {
       builtinJsName = 'length';
       return HType.INTEGER;
     } else if (name == const SourceString('add') && inputs[1].isArray()) {
       builtinJsName = 'push';
     } else if (name == const SourceString('removeLast')
                && inputs[1].isArray()) {
       builtinJsName = 'pop';
     }
     return HType.UNKNOWN;
   }
@@ skipping 1026 matching lines @@
 
   HInstruction get expression() => inputs[0];
 
   HType computeType() => HType.BOOLEAN;
   bool hasExpectedType() => true;
 
   accept(HVisitor visitor) => visitor.visitIs(this);
 
   toString() => "$expression is $typeExpression";
 }