VM: [Kernel] Fix remaining issues with kernel-based async/await implementation

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.
 
 # Disable tests globally for kernel.
 [ $compiler == dartk || $compiler == dartkp ]
 Language/Libraries_and_Scripts/Imports/static_type_t01: Skip # No support for deferred libraries.
 Language/Metadata/*: Skip # No support for metadata ATM.
 LibTest/async/DeferredLibrary/DeferredLibrary_A01_t01: Skip # No support for deferred libraries.
 LibTest/isolate/*: Skip # No support for isolates ATM.
@@ skipping 114 matching lines @@
 Language/Classes/Constructors/Generative_Constructors/execution_of_a_superinitializer_t01: RuntimeError
 Language/Classes/Constructors/Generative_Constructors/execution_of_an_initializer_t02: RuntimeError
 Language/Classes/Constructors/Generative_Constructors/initializing_formals_execution_t02: RuntimeError
 Language/Classes/definition_t23: CompileTimeError
 Language/Enums/declaration_equivalent_t01: RuntimeError
 Language/Expressions/Constants/string_length_t01: Crash
 Language/Expressions/Function_Invocation/Function_Expression_Invocation/not_a_function_expression_t01: RuntimeError
 Language/Expressions/Function_Invocation/Unqualified_Invocation/function_expr_invocation_t03: RuntimeError
 Language/Expressions/Function_Invocation/Unqualified_Invocation/function_expr_invocation_t04: RuntimeError
 Language/Expressions/Function_Invocation/Unqualified_Invocation/static_method_invocation_t02: RuntimeError
-Language/Expressions/Function_Invocation/async_cleanup_t07: Fail
-Language/Expressions/Function_Invocation/async_cleanup_t08: Fail
-Language/Expressions/Function_Invocation/async_generator_invokation_t05: RuntimeError
-Language/Expressions/Function_Invocation/async_generator_invokation_t06: RuntimeError
-Language/Expressions/Function_Invocation/async_generator_invokation_t09: RuntimeError
 Language/Expressions/Identifier_Reference/built_in_identifier_t35: Pass
 Language/Expressions/Identifier_Reference/built_in_identifier_t36: Pass
 Language/Expressions/Identifier_Reference/built_in_identifier_t37: Pass
 Language/Expressions/Identifier_Reference/built_in_not_dynamic_t14: Pass
 Language/Expressions/Identifier_Reference/evaluation_property_extraction_t03: RuntimeError
 Language/Expressions/Identifier_Reference/evaluation_type_parameter_t01: RuntimeError
 Language/Expressions/Instance_Creation/New/evaluation_t12: RuntimeError
 Language/Expressions/Instance_Creation/New/evaluation_t19: RuntimeError
 Language/Expressions/Instance_Creation/New/evaluation_t20: RuntimeError
 Language/Expressions/Lookup/Method_Lookup/superclass_t08: RuntimeError
 Language/Expressions/Method_Invocation/Ordinary_Invocation/accessible_instance_member_t05: RuntimeError
 Language/Expressions/Method_Invocation/Ordinary_Invocation/evaluation_t07: RuntimeError
 Language/Expressions/Method_Invocation/Ordinary_Invocation/method_lookup_failed_t18: RuntimeError
 Language/Expressions/Property_Extraction/General_Closurization/class_object_member_t01: Pass
 Language/Expressions/Property_Extraction/General_Closurization/class_object_member_t02: Pass
 Language/Expressions/Property_Extraction/General_Closurization/class_object_member_t03: Pass
 Language/Expressions/Property_Extraction/General_Closurization/class_object_member_t04: Pass
 Language/Expressions/Property_Extraction/General_Closurization/class_object_member_t05: Pass
 Language/Expressions/Property_Extraction/General_Closurization/class_object_member_t06: Pass
 Language/Expressions/Type_Test/evaluation_t10: RuntimeError
 Language/Functions/External_Functions/not_connected_to_a_body_t01: RuntimeError
 Language/Functions/Formal_Parameters/syntax_t05: RuntimeError
 Language/Libraries_and_Scripts/Exports/invalid_uri_t02: Pass
 Language/Libraries_and_Scripts/Imports/deferred_import_t01: RuntimeError
 Language/Libraries_and_Scripts/Imports/deferred_import_t02: RuntimeError
 Language/Libraries_and_Scripts/Imports/invalid_uri_deferred_t01/01: MissingRuntimeError
 Language/Libraries_and_Scripts/Imports/invalid_uri_t02: Pass
 Language/Libraries_and_Scripts/Parts/syntax_t06: Pass
 Language/Statements/Labels/syntax_t03: Pass
-Language/Statements/Rethrow/execution_t04: RuntimeError
 Language/Statements/Switch/syntax_t02: Pass
 Language/Statements/Try/catch_scope_t01: RuntimeError
-Language/Statements/Yield_and_Yield_Each/Yield/execution_async_t04: Fail
-Language/Statements/Yield_and_Yield_Each/Yield/execution_async_t05: Fail
-Language/Statements/Yield_and_Yield_Each/Yield/execution_async_t06: Fail
-Language/Statements/Yield_and_Yield_Each/Yield_Each/execution_async_t01: RuntimeError
 Language/Types/Interface_Types/subtype_t44: RuntimeError
 Language/Types/Static_Types/deferred_type_t01: RuntimeError
 Language/Variables/final_t01/01: MissingRuntimeError
 Language/Variables/final_t02/01: MissingRuntimeError
 
 # dartk: JIT failures
 [ $compiler == dartk && $runtime == vm ]
 Language/Expressions/Instance_Creation/Const/canonicalized_t05: RuntimeError
 Language/Expressions/Object_Identity/string_t01: RuntimeError
 Language/Expressions/Strings/adjacent_strings_t02: RuntimeError
@@ skipping 16 matching lines @@
 # dartk: precompilation failures
 [ $compiler == dartkp && $runtime == dart_precompiled ]
 LibTest/core/StringBuffer/StringBuffer_A01_t02: RuntimeError
 LibTest/core/StringBuffer/write_A01_t02: RuntimeError
 Language/Expressions/Constants/exception_t01: Crash
 Language/Expressions/Constants/exception_t02: Crash
 
 # dartk: precompilation failures (debug)
 [ $compiler == dartkp && $runtime == dart_precompiled && $mode == debug ]
 Language/Libraries_and_Scripts/Scripts/top_level_main_t05: Crash  # !main_obj.IsNull()