Compute NativeBasicData for KernelWorldBuilder

pkg/compiler/lib/src/compiler.dart

Index: pkg/compiler/lib/src/compiler.dart
diff --git a/pkg/compiler/lib/src/compiler.dart b/pkg/compiler/lib/src/compiler.dart
index 67c4e599583b097f982e000f18d9dcc0501bb249..55093ea9abe2c253c60b31ba1f2570e0f682c895 100644
--- a/pkg/compiler/lib/src/compiler.dart
+++ b/pkg/compiler/lib/src/compiler.dart
@@ -1916,6 +1916,15 @@ class _CompilerElementEnvironment implements ElementEnvironment {
   }
 
   @override
+  void forEachClass(LibraryElement library, void f(ClassElement cls)) {
+    library.implementation.forEachLocalMember((member) {
+      if (member.isClass) {
+        f(member);
+      }
+    });
+  }
+
+  @override
   LibraryElement lookupLibrary(Uri uri, {bool required: false}) {
     LibraryElement library = _libraryProvider.lookupLibrary(uri);
     // If the script of the library is synthesized, the library does not exist