Implement metadata on classes and additional semantic checks.

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 || $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.
 Language/Expressions/Conditional/syntax_t04: MissingCompileTimeError # Test bug: Test doesn't execute erroneous code.
 Language/Expressions/Throw/no_catch_clause_t02: MissingCompileTimeError # Test bug: Test doesn't execute erroneous code.
 Language/Expressions/Throw/no_catch_clause_t03: MissingCompileTimeError # Test bug: Test doesn't execute erroneous code.
@@ skipping 123 matching lines @@
 Language/Metadata/before_param_t03: RuntimeError  # Issue 28434: Kernel IR misses these annotations.
 Language/Metadata/before_param_t04: RuntimeError  # Issue 28434: Kernel IR misses these annotations.
 Language/Metadata/before_param_t05: RuntimeError  # Issue 28434: Kernel IR misses these annotations.
 Language/Metadata/before_param_t06: RuntimeError  # Issue 28434: Kernel IR misses these annotations.
 Language/Metadata/before_param_t07: RuntimeError  # Issue 28434: Kernel IR misses these annotations.
 Language/Metadata/before_param_t08: RuntimeError  # Issue 28434: Kernel IR misses these annotations.
 Language/Metadata/before_param_t09: RuntimeError  # Issue 28434: Kernel IR misses these annotations.
 Language/Metadata/before_typedef_t01: RuntimeError  # Issue 28434: Kernel IR misses these annotations.
 Language/Metadata/before_variable_t01: RuntimeError  # Issue 28434: Kernel IR misses these annotations.
 Language/Metadata/before_variable_t02: RuntimeError  # Issue 28434: Kernel IR misses these annotations.
-Language/Metadata/compilation_t01: MissingCompileTimeError
-Language/Metadata/compilation_t02: MissingCompileTimeError
 Language/Metadata/compilation_t03: MissingCompileTimeError
-Language/Metadata/compilation_t04: MissingCompileTimeError
-Language/Metadata/compilation_t08: MissingCompileTimeError
-Language/Metadata/compilation_t09: MissingCompileTimeError
-Language/Metadata/compilation_t10: MissingCompileTimeError
-Language/Metadata/compilation_t11: MissingCompileTimeError
+Language/Metadata/compilation_t08: Crash
+Language/Metadata/compilation_t10: Crash
 Language/Mixins/Mixin_Application/deferred_t01: MissingCompileTimeError
 Language/Mixins/Mixin_Application/syntax_t16: CompileTimeError # Issue 25765
 Language/Mixins/declaring_constructor_t05: MissingCompileTimeError # Issue 24767
 Language/Mixins/declaring_constructor_t06: MissingCompileTimeError # Issue 24767
 Language/Reference/Lexical_Rules/Reserved_Words/void_t05: DartkCrash
 Language/Statements/Continue/label_t06: MissingCompileTimeError
 Language/Statements/Continue/label_t07: MissingCompileTimeError
 Language/Statements/Continue/label_t08: MissingCompileTimeError
 Language/Statements/Continue/label_t09: MissingCompileTimeError
 Language/Statements/Continue/label_t10: MissingCompileTimeError
@@ skipping 28 matching lines @@
 
 # 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
-Language/Metadata/before_class_t01: RuntimeError
 Language/Metadata/before_type_param_t01: RuntimeError
-Language/Metadata/compilation_t01: MissingCompileTimeError
-Language/Metadata/compilation_t02: MissingCompileTimeError
-Language/Metadata/compilation_t03: MissingCompileTimeError
-Language/Metadata/compilation_t04: MissingCompileTimeError
-Language/Metadata/compilation_t08: MissingCompileTimeError
-Language/Metadata/compilation_t09: MissingCompileTimeError
-Language/Metadata/compilation_t10: MissingCompileTimeError
-Language/Metadata/compilation_t11: MissingCompileTimeError
 LibTest/isolate/Isolate/spawnUri_A01_t03: Pass, Timeout
 
 # dartk: JIT failures (debug)
 [ $compiler == dartk && $mode == debug ]
 LibTest/isolate/Isolate/spawnUri_A01_t04: Pass, Slow, Timeout
 
 # dartk: precompilation failures
 [ $compiler == dartkp ]
 Language/Classes/Setters/parameter_t05: Crash
 Language/Classes/Setters/parameter_t07: Crash
@@ skipping 36 matching lines @@
 LibTest/collection/SplayTreeMap/inherited_tests_A01_t01: RuntimeError
 LibTest/isolate/Isolate/spawn_A02_t04: RuntimeError
 LibTest/isolate/Isolate/spawn_A02_t05: RuntimeError
 LibTest/isolate/Isolate/spawn_A02_t06: RuntimeError
 LibTest/isolate/Isolate/spawn_A02_t07: 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.