First stab at mixins in VM compiler

tests/language/language.status

 # Copyright (c) 2012, 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.
 
 # This directory contains tests that are intended to show the
 # current state of the language.
 
 # In order to maintain maximum test coverage for all builds,
 # please use the following procedure to mark a test
 # failed on architectures other than the one you are working on.
@@ skipping 38 matching lines @@
 compile_time_constant10_test/none: Fail # issue 5214
 
 export_cyclic_test: Fail, Crash # issue 6060
 duplicate_export_negative_test: Fail # issue 6134
 type_annotation_test/04: Fail # Issue 6970
 type_annotation_test/06: Fail # Issue 6973
 type_annotation_test/09: Fail # Issue 6973
 
 type_parameter_literal_test: Fail # Issue 7551
 
-mixin_field_test: Fail
-mixin_is_test: Fail
-mixin_method_test: Fail
-mixin_naming_test: Fail
-mixin_extends_field_test: Fail
-mixin_extends_is_test: Fail
-mixin_extends_method_test: Fail
-mixin_mixin_test: Fail
 mixin_illegal_syntax_test/none: Fail
-mixin_illegal_superclass_test/none: Fail
-mixin_illegal_constructor_test/none: Fail
-mixin_illegal_static_access_test: Fail
-mixin_illegal_super_use_test/none: Fail
-mixin_implements_test: Fail
 mixin_type_parameters_mixin_test: Fail
 mixin_type_parameters_super_test: Fail
 mixin_type_parameters_mixin_extends_test: Fail
 mixin_type_parameters_super_extends_test: Fail
-mixin_this_use_test: Fail
-mixin_lib_extends_method_test: Fail
 mixin_lib_extends_field_test: Fail
 
 [ $compiler == none && ($system == macos || $system == linux) && $arch == ia32 && $checked ]
 gc_test: Skip  # Issue 1487, flaky.
 
 [ $compiler == none && $mode == debug ]
 gc_test: Skip  # Takes too long.
 
 [ $compiler == none && $unchecked ]
 
@@ skipping 269 matching lines @@
 default_factory2_test/01: Fail # type arguments on redirecting factory not implemented
 default_factory3_test: Fail # type arguments on redirecting factory not implemented
 non_parameterized_factory_test: Fail # type arguments on redirecting factory not implemented
 non_parameterized_factory2_test: Fail # type arguments on redirecting factory not implemented
 type_variable_scope_test: Fail # type arguments on redirecting factory not implemented
 
 many_overridden_no_such_method_test: Fail, Pass, OK # Fails in minified mode, test depends on method names.
 overridden_no_such_method_test: Fail, Pass, OK # Fails in minified mode, test depends on method names.
 
 # Mixins fail on the VM.
-mixin_field_test: Fail                          # VM issue
-mixin_is_test: Fail                             # VM issue
-mixin_method_test: Fail                         # VM issue
-mixin_naming_test: Fail                         # VM issue
-mixin_extends_field_test: Fail                  # VM issue
-mixin_extends_is_test: Fail                     # VM issue
-mixin_extends_method_test: Fail                 # VM issue
-mixin_mixin_test: Fail                          # VM issue
 mixin_illegal_syntax_test/none: Fail            # VM issue
-mixin_illegal_superclass_test/none: Fail        # VM issue
 mixin_illegal_constructor_test/none: Fail       # VM issue
-mixin_illegal_super_use_test/none: Fail         # VM issue
-mixin_implements_test: Fail                     # VM issue
 mixin_type_parameters_mixin_test: Fail          # VM issue
 mixin_type_parameters_super_test: Fail          # VM issue
 mixin_type_parameters_mixin_extends_test: Fail  # VM issue
 mixin_type_parameters_super_extends_test: Fail  # VM issue
-mixin_this_use_test: Fail                       # VM issue
-mixin_lib_extends_method_test: Fail             # VM issue
-mixin_lib_extends_field_test: Fail              # VM issue
 
 # Malformed types not handled as unresolved:
 import_core_prefix_test: Fail
 prefix16_test: Fail
 prefix22_test: Fail
 type_annotation_test/04: Fail
 type_annotation_test/06: Fail
 
 # Calling unresolved class constructor:
 call_nonexistent_constructor_test: Fail
@@ skipping 188 matching lines @@
 *: Skip
 
 [ $arch == simarm ]
 *: Skip
 
 [ $arch == mips ]
 *: Skip
 
 [ $arch == simmips ]
 *: Skip