Gardening: Update status file for kernel crash

I believe this is by design as there are no mirrors in precompiled
mode.

Review-Url: https://codereview.chromium.org/2616793003 .

tests/language/language_kernel.status

@@ -373,6 +373,7 @@ stacktrace_rethrow_nonerror_test: RuntimeError
 stack_trace_test: RuntimeError
 string_interpolation7_test: RuntimeError
 super_call4_test: RuntimeError
+regress_28255_test: Crash
 
 # dartk: precompilation failures (debug)
 [ $compiler == dartkp && $runtime == dart_precompiled && $mode == debug ]