dart2js: Create program_builder directory and move corresponding files.

pkg/compiler/lib/src/js_emitter/full_emitter/emitter.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.
 
 part of dart2js.js_emitter;
 
 
 class OldEmitter implements Emitter {
   final Compiler compiler;
   final CodeEmitterTask task;
@@ skipping 1606 matching lines @@
     Map<OutputUnit, jsAst.Expression> outputs =
         new Map<OutputUnit, jsAst.Expression>();
 
     for (Fragment fragment in program.deferredFragments) {
       OutputUnit outputUnit = fragment.outputUnit;
 
       Map<Element, ClassBuilder> descriptors = elementDescriptors[fragment];
 
       if (descriptors != null && descriptors.isNotEmpty) {
         Iterable<LibraryElement> libraries =
-        task.outputLibraryLists[outputUnit];
+            task.outputLibraryLists[outputUnit];
         if (libraries == null) libraries = [];
 
         // TODO(johnniwinther): Avoid creating [CodeBuffer]s.
         List<jsAst.Expression> parts = <jsAst.Expression>[];
         for (LibraryElement library in Elements.sortedByPosition(libraries)) {
           parts.add(generateLibraryDescriptor(library, fragment));
           descriptors.remove(library);
         }
 
         outputs[outputUnit] = new jsAst.ArrayInitializer(parts);
@@ skipping 365 matching lines @@
     for (Element element in compiler.enqueuer.codegen.newlyEnqueuedElements) {
       if (element.isInstanceMember) {
         cachedClassBuilders.remove(element.enclosingClass);
 
         nativeEmitter.cachedBuilders.remove(element.enclosingClass);
 
       }
     }
   }
 }