cleanup patch generation to preseve comments and remove @patch

test/dart_codegen/expect/core/identical.dart

Index: test/dart_codegen/expect/core/identical.dart
diff --git a/test/dart_codegen/expect/core/identical.dart b/test/dart_codegen/expect/core/identical.dart
index c0158c7740ae9a066b38054e7c09560adb8f0abc..1f398d4f5be4894946688ad6091625769368125d 100644
--- a/test/dart_codegen/expect/core/identical.dart
+++ b/test/dart_codegen/expect/core/identical.dart
@@ -1,11 +1,10 @@
 part of dart.core;
 
-@patch bool identical(Object a, Object b) {
+bool identical(Object a, Object b) {
   return ((__x22) => DDC$RT.cast(__x22, dynamic, bool, "CastGeneral",
-      """line 9, column 10 of dart:core/identical.dart: """, __x22 is bool,
+      """line 11, column 10 of dart:core/identical.dart: """, __x22 is bool,
       true))(Primitives.identicalImplementation(a, b));
 }
-@patch int identityHashCode(Object object) => ((__x23) => DDC$RT.cast(__x23,
-    dynamic, int, "CastGeneral",
-    """line 13, column 40 of dart:core/identical.dart: """, __x23 is int,
-    true))(objectHashCode(object));
+int identityHashCode(Object object) => ((__x23) => DDC$RT.cast(__x23, dynamic,
+    int, "CastGeneral", """line 23, column 40 of dart:core/identical.dart: """,
+    __x23 is int, true))(objectHashCode(object));