Fix --verify-on-transition for OSR and concurrent sweep.

runtime/vm/native_entry.cc

Index: runtime/vm/native_entry.cc
diff --git a/runtime/vm/native_entry.cc b/runtime/vm/native_entry.cc
index fadde0b3ce238619172112f47143433944e65b19..e56bfa8eb73409f4f19d10af3a145845b4baa911 100644
--- a/runtime/vm/native_entry.cc
+++ b/runtime/vm/native_entry.cc
@@ -133,6 +133,7 @@ void NativeEntry::NativeCallWrapperNoStackCheck(Dart_NativeArguments args,
   /* Tell MemorySanitizer 'arguments' is initialized by generated code. */
   MSAN_UNPOISON(arguments, sizeof(*arguments));
   Thread* thread = arguments->thread();
+  ASSERT(thread->execution_state() == Thread::kThreadInGenerated);
   if (!arguments->IsNativeAutoSetupScope()) {
     TransitionGeneratedToNative transition(thread);
     func(args);
@@ -174,8 +175,9 @@ void NativeEntry::NativeCallWrapperNoStackCheck(Dart_NativeArguments args,
       delete scope;
     }
     DEOPTIMIZE_ALOT;
-    VERIFY_ON_TRANSITION;
   }
+  ASSERT(thread->execution_state() == Thread::kThreadInGenerated);
+  VERIFY_ON_TRANSITION;
 }