VM: [Kernel] Skip large_class_declaration_test with --compiler=dartk/dartkp

tests/language/language_kernel.status

 # Copyright (c) 2016, the Dart project authors.  Please see the AUTHORS file
 # for details. All rights reserved. Use of this source code is governed by a
 # BSD-style license that can be found in the LICENSE file.
 
 # These tests currently take too long. Remove when they are fixed.
-[ $compiler == dartk ]
-large_class_declaration_test: Skip
-large_implicit_getter_test: Skip
-larger_implicit_getter_test: Skip
+[ $compiler == dartk || $compiler == dartkp ]
+large_class_declaration_test: SkipSlow  # KernelVM Issue 28312
 
 ###############################################################################
 # Dartk Entries
 ###############################################################################
 
 [ $compiler == dartk || $compiler == dartkp ]
 bad_constructor_test/05: DartkCompileTimeError
 conditional_import_string_test: DartkCompileTimeError
 conditional_import_test: DartkCompileTimeError
 conflicting_type_variable_and_setter_test: DartkCompileTimeError
@@ skipping 328 matching lines @@
 # dartk: JIT failures (debug)
 [ $compiler == dartk && $runtime == vm && $mode == debug ]
 async_star_regression_fisk_test: Crash  # Stack mismatch during expression translation.
 async_star_test: Crash  # Stack mismatch during expression translation.
 not_enough_positional_arguments_test/02: Crash  # Dartk Issue 28301
 not_enough_positional_arguments_test/05: Crash  # Dartk Issue 28301
 
 # dartk: precompilation failures
 [ $compiler == dartkp && $runtime == dart_precompiled ]
 if_null_assignment_static_test/35: Crash  # Dartk Issue 28302
-large_class_declaration_test: Pass, Slow
 string_interpolation7_test: RuntimeError  # Dartk Issue 28306
 
 # dartk: precompilation failures (debug)
 [ $compiler == dartkp && $runtime == dart_precompiled && $mode == debug ]
 constructor_named_arguments_test/01: Crash  # Dartk Issue 28301
 not_enough_positional_arguments_test/05: Crash  # Dartk Issue 28301