Extract interceptor calls from raw is-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 3009 matching lines @@
     dartMainRunner(function() { ${mainCall}; });
   } else {
     ${mainCall};
   }
 })$N""");
     addComment('END invoke [main].', buffer);
   }
 
   void emitGetInterceptorMethod(CodeBuffer buffer,
                                 String key,
-                                Iterable<ClassElement> classes) {
+                                Set<ClassElement> classes) {
     jsAst.Statement buildReturnInterceptor(ClassElement cls) {
       return js.return_(js(namer.isolateAccess(cls))['prototype']);
     }
 
     /**
      * Build a JavaScrit AST node for doing a type check on
      * [cls]. [cls] must be an interceptor class.
      */
     jsAst.Statement buildInterceptorCheck(ClassElement cls) {
       jsAst.Expression condition;
@@ skipping 54 matching lines @@
         if (anyNativeClasses) {
           if (Elements.isNativeOrExtendsNative(cls)) hasNative = true;
         }
       }
     }
     if (hasDouble) {
       hasNumber = true;
     }
     if (hasInt) hasNumber = true;
 
-    if (classes == backend.interceptedClasses) {
+    if (classes.containsAll(backend.interceptedClasses)) {
       // I.e. this is the general interceptor.
       hasNative = anyNativeClasses;
     }
 
     jsAst.Block block = new jsAst.Block.empty();
 
     if (hasNumber) {
       jsAst.Statement whenNumber;
 
       /// Note: there are two number classes in play: Dart's [num],
@@ skipping 69 matching lines @@
     buffer.write(jsAst.prettyPrint(
         js('$isolateProperties.$key = #', js.fun(['receiver'], block)),
         compiler));
     buffer.write(N);
   }
 
   /**
    * Emit all versions of the [:getInterceptor:] method.
    */
   void emitGetInterceptorMethods(CodeBuffer buffer) {
-    var specializedGetInterceptors = backend.specializedGetInterceptors;
+    Map<String, Set<ClassElement>> specializedGetInterceptors =
+        backend.specializedGetInterceptors;
     for (String name in specializedGetInterceptors.keys.toList()..sort()) {
-      Iterable<ClassElement> classes = specializedGetInterceptors[name];
+      Set<ClassElement> classes = specializedGetInterceptors[name];
       emitGetInterceptorMethod(buffer, name, classes);
     }
   }
 
   /**
    * Compute all the classes that must be emitted.
    */
   void computeNeededClasses() {
     instantiatedClasses =
         compiler.codegenWorld.instantiatedClasses.where(computeClassFilter())
@@ skipping 949 matching lines @@
 
 const String HOOKS_API_USAGE = """
 // The code supports the following hooks:
 // dartPrint(message)   - if this function is defined it is called
 //                        instead of the Dart [print] method.
 // dartMainRunner(main) - if this function is defined, the Dart [main]
 //                        method will not be invoked directly.
 //                        Instead, a closure that will invoke [main] is
 //                        passed to [dartMainRunner].
 """;