Allow sending static/top-level functions through ports and as isolate

tests/isolate/isolate.status

Index: tests/isolate/isolate.status
diff --git a/tests/isolate/isolate.status b/tests/isolate/isolate.status
index 5a36c41cc43b8152a2dde7d093efcfd794c43084..bdddb149aefc1e4cab50f5b02c68c4c5860c5356 100644
--- a/tests/isolate/isolate.status
+++ b/tests/isolate/isolate.status
@@ -24,6 +24,8 @@ kill_self_test: Fail      # Not implemented yet
 handle_error_test: Fail   # Not implemented yet
 handle_error2_test: Fail  # Not implemented yet
 handle_error3_test: Fail  # Not implemented yet
+function_send_test: Fail   # Not implemented yet
+function_send_test/01 Fail # Not implemented yet
 
 [ $compiler == none && $runtime == ContentShellOnAndroid ]
 *: Skip # Isolate tests are timing out flakily on Android content_shell.  Issue 19795
@@ -40,6 +42,8 @@ pause_test: Fail  # non-zero timer not supported.
 [ $compiler == dart2js ]
 serialization_test: RuntimeError # Issue 1882, tries to access class TestingOnly declared in isolate_patch.dart
 
+function_send_test/01: RuntimeError # dart2js allows sending closures to the same isolate.
+
 [ $compiler == dart2js && $runtime == safari ]
 cross_isolate_message_test: Skip # Issue 12627
 message_test: Skip # Issue 12627