Fix NULL pointer access in ~virtual_identity.

library/DataDefs.cpp

@@ -218,8 +218,10 @@ virtual_identity::virtual_identity(size_t size, TAllocateFn alloc,
 virtual_identity::~virtual_identity()
 {
     // Remove interpose entries, so that they don't try accessing this object later
-    while (!interpose_list.empty())
-        interpose_list.begin()->second->on_host_delete(this);
+    for (auto it = interpose_list.begin(); it != interpose_list.end(); ++it)
+        if (it->second)
+            it->second->on_host_delete(this);
+    interpose_list.clear();
 }
 
 /* Vtable name to identity lookup. */

library/VTableInterpose.cpp

@@ -311,7 +311,7 @@ void VMethodInterposeLinkBase::on_host_delete(virtual_identity *from)
 
         // Unlink the chains
         child_hosts.erase(from);
-        from->interpose_list.erase(vmethod_idx);
+        from->interpose_list[vmethod_idx] = NULL;
     }
 }