Revert two Kernel changes that were causing test failures.

tests/language_strong/language_strong_kernel.status

Index: tests/language_strong/language_strong_kernel.status
diff --git a/tests/language_strong/language_strong_kernel.status b/tests/language_strong/language_strong_kernel.status
index 5b737fe7467ff51460a20f2f9538de386ab20dbf..ba31da23865438e39e9c8133f9489e4f5262580f 100644
--- a/tests/language_strong/language_strong_kernel.status
+++ b/tests/language_strong/language_strong_kernel.status
@@ -3,9 +3,16 @@
 # BSD-style license that can be found in the LICENSE file.
 
 [ $compiler == dartk && $runtime == vm ]
+arithmetic2_test: RuntimeError # Throws CastError instead of TypeError
+assertion_test: RuntimeError
 async_await_test/02: DartkCompileTimeError
 async_await_test/03: DartkCompileTimeError
 async_await_test/none: DartkCompileTimeError
+async_star_cancel_and_throw_in_finally_test: RuntimeError
+async_star_cancel_while_paused_test: RuntimeError
+async_star_regression_fisk_test: Timeout
+async_star_stream_take_test: Timeout
+async_star_take_reyield_test: Timeout
 async_star_test/01: DartkCompileTimeError
 async_star_test/02: DartkCompileTimeError
 async_star_test/03: DartkCompileTimeError