Move common identifiers, names and selectors to a separate library.

pkg/compiler/lib/src/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 113 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(
-        new UniverseSelector(new Selector.call("toString", null, 0), null));
-    world.registerInvokedGetter(
-        new UniverseSelector(new Selector.getter("hashCode", null), null));
+    world.registerInvocation(new UniverseSelector(
+        new Selector.call(const PublicName("toString"), 0), null));
+    world.registerInvokedGetter(new UniverseSelector(
+        new Selector.getter(const PublicName("hashCode")), null));
     world.registerInvocation(
         new UniverseSelector(new Selector.binaryOperator("=="), null));
-    world.registerInvocation(
-        new UniverseSelector(new Selector.call("compareTo", null, 1), null));
+    world.registerInvocation(new UniverseSelector(
+        new Selector.call(const PublicName("compareTo"), 1), null));
   }
 
   WorldImpact codegen(CodegenWorkItem work) => const WorldImpact();
 
   /**
    * Tells whether we should output given element. Corelib classes like
    * Object should not be in the resulting code.
    */
   @override
   bool shouldOutput(Element element) {
@@ skipping 365 matching lines @@
   }
 
   // TODO(johnniwinther): Remove this when values are computed from the
   // expressions.
   @override
   void copyConstantValues(DartConstantTask task) {
     constantCompiler.constantValueMap.addAll(
         task.constantCompiler.constantValueMap);
   }
 }