Better dependency tracking

sdk/lib/_internal/compiler/implementation/dart_backend/backend.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 dart_backend;
 
 // TODO(ahe): This class is simply wrong.  This backend should use
 // elements when it can, not AST nodes.  Perhaps a [Map<Element,
 // TreeElements>] is what is needed.
 class ElementAst {
@@ skipping 114 matching lines @@
     final LITERAL_TYPE_NAMES = const [
       'Map', 'List', 'num', 'int', 'double', 'bool'
     ];
     final coreLibrary = compiler.coreLibrary;
     for (final name in LITERAL_TYPE_NAMES) {
       ClassElement classElement = coreLibrary.findLocal(name);
       classElement.ensureResolved(compiler);
     }
     // Enqueue the methods that the VM might invoke on user objects because
     // we don't trust the resolution to always get these included.
-    world.registerInvocation(
-        null, new Selector.call("toString", null, 0));
-    world.registerInvokedGetter(
-        null, new Selector.getter("hashCode", null));
-    world.registerInvocation(
-        null, new Selector.binaryOperator("=="));
-    world.registerInvocation(
-        null, new Selector.call("compareTo", null, 1));
+    world.registerInvocation(new Selector.call("toString", null, 0));
+    world.registerInvokedGetter(new Selector.getter("hashCode", null));
+    world.registerInvocation(new Selector.binaryOperator("=="));
+    world.registerInvocation(new Selector.call("compareTo", null, 1));
   }
 
   void codegen(CodegenWorkItem work) { }
 
   bool isUserLibrary(LibraryElement lib) => !lib.isPlatformLibrary;
 
   /**
    * Tells whether we should output given element. Corelib classes like
    * Object should not be in the resulting code.
    */
@@ skipping 514 matching lines @@
   }
 
   Constant compileMetadata(MetadataAnnotation metadata,
                            Node node,
                            TreeElements elements) {
     return measure(() {
       return constantCompiler.compileMetadata(metadata, node, elements);
     });
   }
 }