Avoid triggering an ASSERT in TypedData

runtime/tests/vm/vm.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.
 
 # Issue 28198
 cc/IsolateReload_PendingUnqualifiedCall_InstanceToStatic: SkipSlow
 cc/IsolateReload_PendingUnqualifiedCall_StaticToInstance: SkipSlow
 cc/IsolateReload_PendingConstructorCall_AbstractToConcrete: SkipSlow
 cc/IsolateReload_PendingConstructorCall_ConcreteToAbstract: SkipSlow
 cc/IsolateReload_PendingStaticCall_DefinedToNSM: SkipSlow
@@ skipping 403 matching lines @@
 
 [ ($compiler == dartk) && ($runtime == vm) && ($mode == release) ]
 cc/InjectNativeFields1: Fail
 cc/InjectNativeFields3: Fail
 cc/Service_TokenStream: Fail
 
 [ ($compiler == dartk) && ($runtime == vm) && ($mode == debug) ]
 cc/InjectNativeFields1: Crash
 cc/InjectNativeFields3: Crash
 cc/Service_TokenStream: Crash
-cc/IsolateReload_KernelIncrementalCompileAppAndLib: Crash # Issue 30420
 
 [ ($compiler == dartk) && ($runtime == vm) && ($system == macos) ]
 cc/IsolateReload_DanglingGetter_Class: Crash
 cc/IsolateReload_DanglingGetter_Instance: Crash
 cc/IsolateReload_DanglingGetter_Library: Crash
 cc/IsolateReload_DanglingSetter_Class: Crash
 cc/IsolateReload_DanglingSetter_Instance: Crash
 cc/IsolateReload_DanglingSetter_Library: Crash
 cc/IsolateReload_EnumDelete: Crash
 cc/IsolateReload_LibraryLookup: Crash
 cc/IsolateReload_RunNewFieldInitialiazersSuperClass: Crash
 cc/IsolateReload_RunNewFieldInitializersThrows: Crash
 cc/IsolateReload_TearOff_AddArguments2: Crash
 cc/IsolateReload_TearOff_AddArguments: Crash
 cc/IsolateReload_TearOff_Class_Identity: Crash
 cc/IsolateReload_TearOff_Instance_Equality: Crash
 cc/IsolateReload_TearOff_Library_Identity: Crash
 cc/IsolateReload_TearOff_List_Set: Crash
 cc/IsolateReload_TypeIdentity: Crash
 cc/IsolateReload_TypeIdentityGeneric: Crash
 cc/IsolateReload_TypeIdentityParameter: Crash
 cc/Parser_AllocateVariables_CaptureLoopVar: Crash
 cc/Parser_AllocateVariables_Issue7681: Crash
 cc/Parser_AllocateVariables_MiddleChain: Crash
 cc/Parser_AllocateVariables_NestedCapturedVar: Crash
 cc/Parser_AllocateVariables_TwoChains: Crash