Reapply "Make int a double in argument type checks."

sdk/lib/_internal/compiler/implementation/js_backend/emitter.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 js_backend;
 
 /**
  * A function element that represents a closure call. The signature is copied
  * from the given element.
  */
@@ skipping 1236 matching lines @@
 
   void emitRuntimeTypeSupport(CodeBuffer buffer) {
     RuntimeTypes rti = backend.rti;
     TypeChecks typeChecks = rti.requiredChecks;
 
     // Add checks to the constructors of instantiated classes.
     for (ClassElement cls in typeChecks) {
       String holder = namer.isolateAccess(backend.getImplementationClass(cls));
       for (TypeCheck check in typeChecks[cls]) {
         ClassElement cls = check.cls;
-        buffer.write('$holder.${namer.operatorIs(check.cls)}$_=${_}true$N');
         buffer.write('$holder.${namer.operatorIs(cls)}$_=${_}true$N');
         Substitution substitution = check.substitution;
         if (substitution != null) {
           String body = substitution.getCode(rti, false);
           buffer.write('$holder.${namer.substitutionName(cls)}$_=${_}$body$N');
         }
       };
     }
   }
 
@@ skipping 1984 matching lines @@
         functions.push(property);
       } else {
         $$[property] = element;
         classes.push(property);
         classes.push(element[""]);
       }
     }
     libraries.push([name, uri, classes, functions]);
   }
 })''';