dart2js cps: More aggressive operator specialization.

pkg/compiler/lib/src/cps_ir/redundant_join.dart

 // Copyright (c) 2015, 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 dart2js.cps_ir.redundant_join_elimination;
 
 import 'cps_ir_nodes.dart';
 import 'optimizers.dart';
 
 /// Eliminates redundant join points.
@@ skipping 194 matching lines @@
 ///
 ///   LetCont (k1 x = (return x)) in
 ///   LetCont (k2 x = (InvokeContinuation k3 x)) in ...
 ///     =>
 ///   LetCont (k1 x = (return x)) in
 ///   LetCont (k2 x' = (InvokeContinuation k3 x')) in ...
 ///
 /// After lifting LetConts in the main pass above, parameter objects can have
 /// multiple bindings. Each reference implicitly refers to the binding that
 /// is currently in scope.
-/// 
+///
 /// This returns the IR to its normal form after redundant joins have been
 /// eliminated.
 class AlphaRenamer extends TrampolineRecursiveVisitor {
   Map<Parameter, Parameter> renaming = <Parameter, Parameter>{};
 
   processContinuation(Continuation cont) {
     if (cont.isReturnContinuation) return;
 
     List<Parameter> shadowedKeys = <Parameter>[];
     List<Parameter> shadowedValues = <Parameter>[];
@@ skipping 25 matching lines @@
     });
   }
 
   processReference(Reference ref) {
     Parameter target = renaming[ref.definition];
     if (target != null) {
       ref.changeTo(target);
     }
   }
 }