Enable causal stacktrace in kernel

tests/language/language_kernel.status

Index: tests/language/language_kernel.status
diff --git a/tests/language/language_kernel.status b/tests/language/language_kernel.status
index 5a7362765ba38ae40e460f5fdf32667999e438ad..97772c929de34386e26348a87549bf2516a657fa 100644
--- a/tests/language/language_kernel.status
+++ b/tests/language/language_kernel.status
@@ -44,7 +44,7 @@ vm/debug_break_enabled_vm_test/01: CompileTimeError
 vm/debug_break_enabled_vm_test/none: CompileTimeError
 vm/reflect_core_vm_test: CompileTimeError
 vm/regress_27201_test: CompileTimeError
-vm/regress_28325_test: RuntimeError  # Issue 28055.
+# vm/regress_28325_test: RuntimeError  # Issue 28055. Passes by mistake.

[Kevin Millikin (Google), 2017/02/22 10:42:18]

Uncomment the line and give it an expectation of Pass?

[jensj, 2017/02/23 09:40:26]

Done.

 
 # dartk: JIT failures
 [ $compiler == dartk && $runtime == vm ]
@@ -203,9 +203,8 @@ library_env_test/has_no_mirror_support: RuntimeError
 main_not_a_function_test/01: Crash
 redirecting_factory_reflection_test: RuntimeError
 
-# Casual async stack traces are not implemented for Kernel.
+# Casual async stack traces does not give exactly same stacktrace on kernel
 vm/causal_async_exception_stack_test: RuntimeError

[Kevin Millikin (Google), 2017/02/22 10:42:18]

I think this might be caused by not setting the parent function of SyncYielding
functions to be correctly sync*/async/async*.  That is used to hide the names of
the generated functions.

[jensj, 2017/02/23 09:40:26]

It seems you are correct. It passes now.

-vm/causal_async_exception_stack2_test: RuntimeError
 
 # dartk: JIT failures (debug)
 [ $compiler == dartk && $runtime == vm && $mode == debug ]