Add self-reference sources into INCLUDED_PARTS.

pkg/analyzer/test/generated/compile_time_error_code_test.dart

Index: pkg/analyzer/test/generated/compile_time_error_code_test.dart
diff --git a/pkg/analyzer/test/generated/compile_time_error_code_test.dart b/pkg/analyzer/test/generated/compile_time_error_code_test.dart
index ac6549c652813f004f1933828870c579fc6a08bf..c8ff9ae5a063e88c49e2eef819a5059e5049629b 100644
--- a/pkg/analyzer/test/generated/compile_time_error_code_test.dart
+++ b/pkg/analyzer/test/generated/compile_time_error_code_test.dart
@@ -4705,6 +4705,15 @@ part 'l2.dart';''');
     verify([source]);
   }
 
+  void test_partOfNonPart_self() {
+    Source source = addSource(r'''
+library lib;
+part 'test.dart';''');
+    computeLibrarySourceErrors(source);
+    assertErrors(source, [CompileTimeErrorCode.PART_OF_NON_PART]);
+    verify([source]);
+  }
+
   void test_prefix_conditionalPropertyAccess_call() {
     AnalysisOptionsImpl options = new AnalysisOptionsImpl();
     options.enableNullAwareOperators = true;