emit interfaces before use

lib/runtime/dart/_internal.js

Index: lib/runtime/dart/_internal.js
diff --git a/lib/runtime/dart/_internal.js b/lib/runtime/dart/_internal.js
index 1ad36b0d8bb0adce9b42233b90ebe3f48870c017..0cfc5ad3ac00a5e82e0d4ef990c14f13794e7b1f 100644
--- a/lib/runtime/dart/_internal.js
+++ b/lib/runtime/dart/_internal.js
@@ -1,8 +1,7 @@
 var _internal;
 (function(exports) {
   'use strict';
-  class EfficientLength extends core.Object {
-  }
+  class EfficientLength extends core.Object {}
   let ListIterable$ = dart.generic(function(E) {
     class ListIterable extends collection.IterableBase$(E) {
       ListIterable() {
@@ -857,8 +856,7 @@ var _internal;
   });
   let EmptyIterator = EmptyIterator$(dart.dynamic);
   let BidirectionalIterator$ = dart.generic(function(T) {
-    class BidirectionalIterator extends core.Object {
-    }
+    class BidirectionalIterator extends core.Object {}
     BidirectionalIterator[dart.implements] = [core.Iterator$(T)];
     return BidirectionalIterator;
   });
@@ -1349,14 +1347,12 @@ var _internal;
   });
   let UnmodifiableListMixin = UnmodifiableListMixin$(dart.dynamic);
   let FixedLengthListBase$ = dart.generic(function(E) {
-    class FixedLengthListBase extends dart.mixin(FixedLengthListMixin$(E)) {
-    }
+    class FixedLengthListBase extends dart.mixin(FixedLengthListMixin$(E)) {}
     return FixedLengthListBase;
   });
   let FixedLengthListBase = FixedLengthListBase$(dart.dynamic);
   let UnmodifiableListBase$ = dart.generic(function(E) {
-    class UnmodifiableListBase extends dart.mixin(UnmodifiableListMixin$(E)) {
-    }
+    class UnmodifiableListBase extends dart.mixin(UnmodifiableListMixin$(E)) {}
     return UnmodifiableListBase;
   });
   let UnmodifiableListBase = UnmodifiableListBase$(dart.dynamic);