dart2js cps: Better 'is int' checks.

pkg/compiler/lib/src/tree_ir/optimization/logical_rewriter.dart

 // Copyright (c) 2014, 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 tree_ir.optimization.logical_rewriter;
 
 import '../tree_ir_nodes.dart';
 import 'optimization.dart' show Pass;
 import '../../constants/values.dart' as values;
 
@@ skipping 230 matching lines @@
   bool operatorReturnsBool(BuiltinOperator operator) {
     switch (operator) {
       case BuiltinOperator.StrictEq:
       case BuiltinOperator.StrictNeq:
       case BuiltinOperator.LooseEq:
       case BuiltinOperator.LooseNeq:
       case BuiltinOperator.NumLt:
       case BuiltinOperator.NumLe:
       case BuiltinOperator.NumGt:
       case BuiltinOperator.NumGe:
+      case BuiltinOperator.IsNumber:
+      case BuiltinOperator.IsNotNumber:
+      case BuiltinOperator.IsFloor:
+      case BuiltinOperator.IsNumberAndFloor:
         return true;
       default:
         return false;
     }
   }
 
   BuiltinOperator negateBuiltin(BuiltinOperator operator) {
     switch (operator) {
       case BuiltinOperator.StrictEq: return BuiltinOperator.StrictNeq;
       case BuiltinOperator.StrictNeq: return BuiltinOperator.StrictEq;
       case BuiltinOperator.LooseEq: return BuiltinOperator.LooseNeq;
       case BuiltinOperator.LooseNeq: return BuiltinOperator.LooseEq;
+      case BuiltinOperator.IsNumber: return BuiltinOperator.IsNotNumber;
+      case BuiltinOperator.IsNotNumber: return BuiltinOperator.IsNumber;
 
       // Because of NaN, these do not have a negated form.
       case BuiltinOperator.NumLt:
       case BuiltinOperator.NumLe:
       case BuiltinOperator.NumGt:
       case BuiltinOperator.NumGe:
         return null;
 
       default:
         return null;
@@ skipping 130 matching lines @@
 
   Expression makeOr(Expression e1, Expression e2, {bool liftNots: true}) {
     if (e1 is Not && e2 is Not && liftNots) {
       return new Not(new LogicalOperator.and(e1.operand, e2.operand));
     } else {
       return new LogicalOperator.or(e1, e2);
     }
   }
 }