Speed up _wouldBeTooManyUsers.

pkg/compiler/lib/src/inferrer/node_tracer.dart

 // Copyright (c) 2013, 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 compiler.src.inferrer.node_tracer;
 
 import '../common/names.dart' show Identifiers;
 import '../compiler.dart' show Compiler;
 import '../elements/elements.dart';
 import '../types/types.dart' show ContainerTypeMask, MapTypeMask;
@@ skipping 95 matching lines @@
 
   void addNewEscapeInformation(TypeInformation info) {
     if (flowsInto.contains(info)) return;
     flowsInto.add(info);
     workList.add(info);
   }
 
   bool _wouldBeTooManyUsers(Set users) {
     int seenSoFar = analyzedElements.length;
     if (seenSoFar + users.length <= MAX_ANALYSIS_COUNT) return false;
-    int actualWork = users
-        .where((TypeInformation user) => !analyzedElements.contains(user.owner))
-        .length;
-    return seenSoFar + actualWork > MAX_ANALYSIS_COUNT;
+    int actualWork = 0;
+    for (TypeInformation user in users) {
+      if (!analyzedElements.contains(user.owner)) {
+        actualWork++;
+        if (actualWork > MAX_ANALYSIS_COUNT - seenSoFar) return true;
+      }
+    }
+    return false;
   }
 
   void analyze() {
     // Collect the [TypeInformation] where the list can flow in,
     // as well as the operations done on all these [TypeInformation]s.
     addNewEscapeInformation(tracedType);
     while (!workList.isEmpty) {
       currentUser = workList.removeLast();
       if (_wouldBeTooManyUsers(currentUser.users)) {
         bailout('Too many users');
@@ skipping 268 matching lines @@
     }
     if (isParameterOfListAddingMethod(info.element) ||
         isParameterOfMapAddingMethod(info.element)) {
       // These elements are being handled in
       // [visitDynamicCallSiteTypeInformation].
       return;
     }
     addNewEscapeInformation(info);
   }
 }