CrossThreadPersistent invalidation: add missing orphaned check.

Source/platform/heap/PersistentNode.cpp

Index: Source/platform/heap/PersistentNode.cpp
diff --git a/Source/platform/heap/PersistentNode.cpp b/Source/platform/heap/PersistentNode.cpp
index aed8a39bcae70c543f5b9b58f96e615780779fd9..6271f7d6ea72c36c01868d2a242d3f18b4db3406 100644
--- a/Source/platform/heap/PersistentNode.cpp
+++ b/Source/platform/heap/PersistentNode.cpp
@@ -119,6 +119,10 @@ void CrossThreadPersistentRegion::prepareForThreadStateTermination(ThreadState*
                 continue;
             BasePage* page = pageFromObject(rawObject);
             ASSERT(page);
+            // The main thread will upon detach just mark its heap pages as orphaned,
+            // but not invalidate its CrossThreadPersistent<>s.
+            if (page->orphaned())
+                continue;
             if (page->heap()->threadState() == threadState)

[haraken, 2015/08/05 14:22:33]

ah, page->heap() should be null for already orphaned pages.

                 persistent->clear();
         }