Invalidate cross-thread persistents on heap termination.

Source/platform/heap/ThreadState.cpp

Index: Source/platform/heap/ThreadState.cpp
diff --git a/Source/platform/heap/ThreadState.cpp b/Source/platform/heap/ThreadState.cpp
index 079ac1912d0ce202fbbc8a761bbc15343b422211..f751bba454a88eeb6e42e80aaae8a002596dcfe4 100644
--- a/Source/platform/heap/ThreadState.cpp
+++ b/Source/platform/heap/ThreadState.cpp
@@ -241,7 +241,9 @@ void ThreadState::cleanup()
         // Set the terminate flag on all heap pages of this thread. This is used to
         // ensure we don't trace pages on other threads that are not part of the
         // thread local GC.
-        prepareHeapForTermination();
+        prepareForThreadStateTermination();
+
+        ThreadState::crossThreadPersistentRegion().prepareForThreadStateTermination(this);
 
         // Do thread local GC's as long as the count of thread local Persistents
         // changes and is above zero.
@@ -1153,7 +1155,7 @@ void ThreadState::postSweep()
     }
 }
 
-void ThreadState::prepareHeapForTermination()
+void ThreadState::prepareForThreadStateTermination()
 {
     ASSERT(checkThread());
     for (int i = 0; i < NumberOfHeaps; ++i)