dart2js cps: Compute intercepted classes in optimize_interceptors.

pkg/compiler/lib/src/js_backend/codegen/codegen.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 code_generator;
 
 import 'glue.dart';
 
 import '../../closure.dart' show
     ClosureClassElement;
@@ skipping 845 matching lines @@
         visitExpressionList(node.arguments));
     js.Expression argumentNames = new js.ArrayInitializer(
         node.selector.namedArguments.map(js.string).toList(growable: false));
     return buildStaticHelperInvocation(glue.createInvocationMirrorMethod,
         <js.Expression>[name, internalName, kind, arguments, argumentNames]);
   }
 
   @override
   js.Expression visitInterceptor(tree_ir.Interceptor node) {
     registry.registerUseInterceptor();
-    registry.registerSpecializedGetInterceptor(node.interceptedClasses);
-    js.Name helperName = glue.getInterceptorName(node.interceptedClasses);
+    // Default to all intercepted classes if they have not been computed.

[sra1, 2016/01/08 03:24:04]

Does the lack of a recomputed result is mean something?
Or is it just to decouple passes?
Explain in comment.

[asgerf, 2016/01/08 17:17:48]

Just to decouple passes. Added comment.

+    Set<ClassElement> interceptedClasses = node.interceptedClasses.isEmpty
+        ? glue.interceptedClasses
+        : node.interceptedClasses;
+    registry.registerSpecializedGetInterceptor(interceptedClasses);
+    js.Name helperName = glue.getInterceptorName(interceptedClasses);
     js.Expression globalHolder = glue.getInterceptorLibrary();
     return js.js('#.#(#)',
         [globalHolder, helperName, visitExpression(node.input)])
             .withSourceInformation(node.sourceInformation);
   }
 
   @override
   js.Expression visitGetField(tree_ir.GetField node) {
     registry.registerStaticUse(new StaticUse.fieldGet(node.field));
     return new js.PropertyAccess(
@@ skipping 336 matching lines @@
   void registerDefaultParameterValues(ExecutableElement element) {
     if (element is! FunctionElement) return;
     FunctionElement function = element;
     if (function.isStatic) return; // Defaults are inlined at call sites.
     function.functionSignature.forEachOptionalParameter((param) {
       ConstantValue constant = glue.getDefaultParameterValue(param);
       registry.registerCompileTimeConstant(constant);
     });
   }
 }