Move runtime js files down to lib/runtime/dart

lib/src/codegen/js_codegen.dart

 // Copyright (c) 2015, 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 dev_compiler.src.codegen.js_codegen;
 
 import 'dart:collection' show HashSet, HashMap, SplayTreeSet;
 
 import 'package:analyzer/analyzer.dart' hide ConstantEvaluator;
 import 'package:analyzer/src/generated/ast.dart' hide ConstantEvaluator;
@@ skipping 21 matching lines @@
 import 'code_generator.dart';
 import 'js_field_storage.dart';
 import 'js_names.dart' as JS;
 import 'js_metalet.dart' as JS;
 import 'js_module_item_order.dart';
 import 'js_printer.dart' show writeJsLibrary;
 import 'side_effect_analysis.dart';
 
 // Various dynamic helpers we call.
 // If renaming these, make sure to check other places like the
-// dart_runtime.js file and comments.
+// _runtime.js file and comments.
 // TODO(jmesserly): ideally we'd have a "dynamic call" dart library we can
 // import and generate calls to, rather than dart_runtime.js
 const DPUT = 'dput';
 const DLOAD = 'dload';
 const DINDEX = 'dindex';
 const DSETINDEX = 'dsetindex';
 const DCALL = 'dcall';
 const DSEND = 'dsend';
 
 class JSCodegenVisitor extends GeneralizingAstVisitor with ClosureAnnotator {
@@ skipping 135 matching lines @@
     // TODO(jmesserly): it would be great to run the renamer on the body,
     // then figure out if we really need each of these parameters.
     // See ES6 modules: https://github.com/dart-lang/dev_compiler/issues/34
     var params = [_exportsVar, _runtimeLibVar];
     var processImport =
         (LibraryElement library, JS.TemporaryId temp, List list) {
       params.add(temp);
       list.add(js.string(compiler.getModuleName(library.source.uri), "'"));
     };
 
-    var imports = <JS.Expression>[js.string('dart_runtime/dart')];
+    var imports = <JS.Expression>[js.string('dart/_runtime')];
     _imports.forEach((library, temp) {
       if (_loader.libraryIsLoaded(library)) {
         processImport(library, temp, imports);
       }
     });
 
     var lazyImports = <JS.Expression>[];
     _imports.forEach((library, temp) {
       if (!_loader.libraryIsLoaded(library)) {
         processImport(library, temp, lazyImports);
@@ skipping 3105 matching lines @@
 
 /// A special kind of element created by the compiler, signifying a temporary
 /// variable. These objects use instance equality, and should be shared
 /// everywhere in the tree where they are treated as the same variable.
 class TemporaryVariableElement extends LocalVariableElementImpl {
   TemporaryVariableElement.forNode(Identifier name) : super.forNode(name);
 
   int get hashCode => identityHashCode(this);
   bool operator ==(Object other) => identical(this, other);
 }