Fix dispatch on MemberSets to always go dynamic if needed.

tests/language/language.status

 # Copyright (c) 2011, 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 236 matching lines @@
 FunctionTest: Fail
 FunctionTypeAliasNegativeTest: Fail
 FunctionTypeAliasTest: Fail
 FunctionTypeParameter2Test: Fail
 FunctionTypeParameterTest: Fail
 GenericDeepTest: Fail
 GenericInstanceofTest: Fail
 GenericSyntaxTest: Fail
 GenericTest: Fail
 GenericsTest: Fail
+GetterClosureExecutionOrderTest: Pass # TODO(jmesserly): I don't think this is really passing in the static case
 ImplicitScopeTest: Fail
 ImpliedInterfaceTest: Fail
 IncrOpTest: Fail
 Instanceof2Test: Fail
 InstanceofTest: Fail
 InterfaceFactory3NegativeTest: Fail
 IsNotClass4NegativeTest: Fail
 LabelTest: Fail
 LibraryPrefixesTest: Fail
 Library1NegativeTest: Fail # issue with test see #354
@@ skipping 26 matching lines @@
 Prefix9NegativeTest: Fail
 Prefix11NegativeTest: Fail
 Prefix14NegativeTest: Fail
 Prefix16NegativeTest: Fail
 Prefix20NegativeTest: Fail
 Prefix15Test: Fail
 Private3Test: Fail
 PrivateTest: Fail
 PseudoKWNegativeTest: Fail # verifying test vs. spec - issue #356
 RegExp3Test: Fail
-SavannahTest: Fail
 ScopeNegativeTest: Fail
 ScriptNegativeTest: Fail
 StringConcatTest: Fail
 StringEscapesTest: Fail
 StringInterpolate1NegativeTest: Fail
 StringInterpolate2Test: Fail
 StringInterpolateTest: Fail
 StringTest: Fail
 SuperImplicitClosureTest: Fail
 SuperTest: Fail  # this is testing precise ordering of super constructor call
@@ skipping 19 matching lines @@
 
 [ ($component == frogsh ||  $component == frog || $component == leg || $component == frogium) && $checked ]
 PrivateMemberTest/none: Fail # test seems bad - see issue #353
 
 [ $component == leg ]
 StaticTopLevelTest/00: Fail
 StaticTopLevelTest/03: Fail
 
 [ $component == frog || $component == frogsh || $component == leg ]
 # these tests are inconsistent in frogium and frogsh-node, investigate
-GetterClosureExecutionOrderTest: Fail
 ParameterInitializerTest: Pass
 StaticField1RunNegativeTest: Pass
 StaticField2RunNegativeTest: Pass
 
 [ $component == frogium ]
 # these tests are inconsistent in frogium and frogsh-node, investigate
-GetterClosureExecutionOrderTest: Pass
 ParameterInitializerTest: Fail
 StaticField1RunNegativeTest: Fail
 StaticField2RunNegativeTest: Fail
 
 [ $arch == x64 ]
 *: Skip
 
 [ $arch == simarm ]
 *: Skip
 
 [ $arch == arm ]
 *: Skip