pkg/compiler: fix imports

pkg/compiler/lib/src/cps_ir/finalize.dart

 library dart2js.cps_ir.finalize;
 
+import '../js/js.dart' as js;
+import '../js_backend/backend_helpers.dart';
+import '../js_backend/js_backend.dart' show JavaScriptBackend;
+import 'cps_fragment.dart';
 import 'cps_ir_nodes.dart';
-import 'cps_fragment.dart';
 import 'optimizers.dart' show Pass;
-import '../js_backend/js_backend.dart' show JavaScriptBackend;
-import '../js_backend/backend_helpers.dart';
-import '../js/js.dart' as js;
 
 /// A transformation pass that must run immediately before the tree IR builder.
 ///
 /// This expands [BoundsCheck] nodes into more low-level operations.
 class Finalize extends TrampolineRecursiveVisitor implements Pass {
   String get passName => 'Finalize';
 
   JavaScriptBackend backend;
   BackendHelpers get helpers => backend.helpers;
 
@@ skipping 80 matching lines @@
       // when the refined type is an array type.  Some optimizations assume the
       // type of an object is immutable, but the type of an array can change
       // after allocation.  After the finalize pass, this assumption is no
       // longer needed, so we can replace the remaining idenitity templates.
       Refinement refinement = new Refinement(node.argument(0), node.type)
         ..type = node.type;
       node.replaceWith(refinement);
     }
   }
 }