[kernel] Delete most of the AST

tests/co19/co19-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.
 
 [ $compiler == dartk && $mode == debug ]
 Language/Libraries_and_Scripts/Scripts/top_level_main_t05: Crash
 
 [ $compiler == dartk || $compiler == dartkp ]
 Language/Classes/Constructors/Generative_Constructors/initializers_t12: MissingCompileTimeError # Test bug: Test doesn't execute erroneous code.
 Language/Classes/Constructors/Generative_Constructors/redirection_t09: MissingCompileTimeError # Test bug: Test doesn't execute erroneous code.
@@ skipping 164 matching lines @@
 Language/Types/Type_Declarations/Typedef/self_reference_t08: MissingCompileTimeError
 Language/Types/Type_Declarations/Typedef/self_reference_t09: MissingCompileTimeError
 Language/Types/Type_Void/syntax_t02: MissingCompileTimeError
 Language/Variables/final_or_static_initialization_t02: MissingCompileTimeError
 Language/Variables/final_or_static_initialization_t03: MissingCompileTimeError
 LibTest/async/DeferredLibrary/DeferredLibrary_A01_t01: Skip # No support for deferred libraries.
 LibTest/isolate/Isolate/spawnUri_A01_t06: Skip
 
 [ ($compiler == dartk || $compiler == dartkp) && $mode == debug ]
 Language/Classes/Instance_Variables/constant_t01: Crash
-Language/Statements/Labels/scope_t01: Crash
-Language/Statements/Labels/scope_t07: Crash
 
 # dartk: JIT failures
 [ $compiler == dartk ]
 Language/Classes/Setters/parameter_t05: MissingCompileTimeError
 Language/Classes/Setters/parameter_t07: DartkCrash
 Language/Expressions/Constants/depending_on_itself_t01: MissingCompileTimeError
 Language/Expressions/Constants/depending_on_itself_t02: MissingCompileTimeError
 Language/Expressions/Instance_Creation/Const/canonicalized_t05: RuntimeError
 Language/Expressions/Object_Identity/string_t01: RuntimeError
 Language/Expressions/Strings/adjacent_strings_t02: RuntimeError
@@ skipping 33 matching lines @@
 Language/Statements/Switch/execution_t01: RuntimeError
 Language/Statements/Switch/type_t01: RuntimeError
 Language/Types/Dynamic_Type_System/malbounded_type_error_t01: RuntimeError
 Language/Types/Parameterized_Types/malbounded_t06: RuntimeError
 Language/Types/Static_Types/malformed_type_t04: RuntimeError
 
 # Deferred loading kernel issue 28335.
 [ $compiler == dartk || $compiler == dartkp ]
 Language/Libraries_and_Scripts/Imports/deferred_import_t01: CompileTimeError # Deferred loading kernel issue 28335.
 Language/Libraries_and_Scripts/Imports/deferred_import_t02: CompileTimeError # Deferred loading kernel issue 28335.