Rehash canonical constants table for each class that can be affected by the 'become' operation

tests/lib/lib.status

Index: tests/lib/lib.status
diff --git a/tests/lib/lib.status b/tests/lib/lib.status
index 8f43474406f33ddb2951da874d8d6d9d2e95e255..80c52bbc347078461e9f22b782348e3544697ba7 100644
--- a/tests/lib/lib.status
+++ b/tests/lib/lib.status
@@ -396,11 +396,8 @@ convert/chunked_conversion_utf88_test: Pass, Timeout
 convert/utf85_test: Pass, Timeout
 
 [ $hot_reload || $hot_reload_rollback ]
-async/zone_debug_test: Skip # Issue 27803
-async/intercept_print1_test: Skip # Issue 27803
 async/multiple_timer_test: Pass, Fail # Timing related
 async/stream_transformer_test: Pass, Fail # Closure identity
-convert/json_toEncodable_reviver_test: Skip # Issue 27803
 mirrors/closurization_equivalence_test: SkipByDesign # Method equality
 mirrors/fake_function_with_call_test: SkipByDesign # Method equality