dart:io | Add FileSystemEntity.typeSync to test for symbolic links.

sdk/lib/_internal/compiler/implementation/lib/io_patch.dart

Index: sdk/lib/_internal/compiler/implementation/lib/io_patch.dart
diff --git a/sdk/lib/_internal/compiler/implementation/lib/io_patch.dart b/sdk/lib/_internal/compiler/implementation/lib/io_patch.dart
index 9354a6bf4c57eae9da614e01d81c3005e7af69f4..bbb5637623f305aacd0c8b89ad1d98476a0324df 100644
--- a/sdk/lib/_internal/compiler/implementation/lib/io_patch.dart
+++ b/sdk/lib/_internal/compiler/implementation/lib/io_patch.dart
@@ -53,6 +53,12 @@ patch class _FileUtils {
   }
 }
 
+patch class FileSystemEntity {
+  patch static int _getType(String path, bool followLinks) {
+    throw new UnsupportedError("FileSystemEntity._getType");
+  }
+}
+
 patch class _File {
   patch static _exists(String path) {
     throw new UnsupportedError("File._exists");