Treat Object and dynamic similarly

test/dart_codegen/expect/convert/string_conversion.dart

Index: test/dart_codegen/expect/convert/string_conversion.dart
diff --git a/test/dart_codegen/expect/convert/string_conversion.dart b/test/dart_codegen/expect/convert/string_conversion.dart
index 4c7737b0c4a276cc8e5e29d62f2cfb4f644c35fa..7fce8fa0221f8654bffd3a4579270216143e94a6 100644
--- a/test/dart_codegen/expect/convert/string_conversion.dart
+++ b/test/dart_codegen/expect/convert/string_conversion.dart
@@ -46,14 +46,14 @@ if (_buffer.isNotEmpty) _flush();
  Iterator iterator = objects.iterator;
  if (!iterator.moveNext()) return; if (separator.isEmpty) {
 do {
-_chunkedSink.add(((__x29) => DEVC$RT.cast(__x29, dynamic, String, "CastGeneral", """line 147, column 26 of dart:convert/string_conversion.dart: """, __x29 is String, true))(iterator.current.toString()));
+_chunkedSink.add(((__x28) => DEVC$RT.cast(__x28, dynamic, String, "CastGeneral", """line 147, column 26 of dart:convert/string_conversion.dart: """, __x28 is String, true))(iterator.current.toString()));
 }
  while (iterator.moveNext());}
  else {
-_chunkedSink.add(((__x30) => DEVC$RT.cast(__x30, dynamic, String, "CastGeneral", """line 150, column 24 of dart:convert/string_conversion.dart: """, __x30 is String, true))(iterator.current.toString()));
+_chunkedSink.add(((__x29) => DEVC$RT.cast(__x29, dynamic, String, "CastGeneral", """line 150, column 24 of dart:convert/string_conversion.dart: """, __x29 is String, true))(iterator.current.toString()));
  while (iterator.moveNext()) {
 write(separator);
- _chunkedSink.add(((__x31) => DEVC$RT.cast(__x31, dynamic, String, "CastGeneral", """line 153, column 26 of dart:convert/string_conversion.dart: """, __x31 is String, true))(iterator.current.toString()));
+ _chunkedSink.add(((__x30) => DEVC$RT.cast(__x30, dynamic, String, "CastGeneral", """line 153, column 26 of dart:convert/string_conversion.dart: """, __x30 is String, true))(iterator.current.toString()));
 }
 }
 }