Clean up operator names.

dart/sdk/lib/_internal/compiler/implementation/ssa/optimize.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 ssa;
 
 abstract class OptimizationPhase {
   String get name;
   void visitGraph(HGraph graph);
 }
@@ skipping 441 matching lines @@
       return foldBuiltinEqualsCheck(node);
     }
 
     if (left.isConstant() && right.isConstant()) {
       return super.visitEquals(node);
     }
 
     HType leftType = types[left];
     if (leftType.isExact()) {
       HBoundedType type = leftType;
-      Element element = type.lookupMember(Elements.OPERATOR_EQUALS);
+      Element element = type.lookupMember(const SourceString('=='));
       if (element != null) {
         // If the left-hand side is guaranteed to be a non-primitive
         // type and and it defines operator==, we emit a call to that
         // operator.
         return super.visitEquals(node);
       } else if (right.isConstantNull()) {
         return graph.addConstantBool(false, constantSystem);
       } else {
         // We can just emit an identity check because the type does
         // not implement operator=.
@@ skipping 881 matching lines @@
     }
 
     // For other fields having setters in the generative constructor body, set
     // the type to UNKNOWN to avoid relying on the type set in the initializer
     // list.
     allSetters.forEach((Element element) {
       backend.registerFieldConstructor(element, HType.UNKNOWN);
     });
   }
 }