Switch to ConcurrentHashMap in SeqClassHierarchyFactory #1379
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I believe this should address #1377. See 74b6c74. For some reason at that point we decided not to use the type system to enforce use of a
ConcurrentHashMapalways. In this spirit of trying not to break things I didn't do that here, but instead changedSeqClassHierarchyFactoryto useConcurrentHashMap.Fixes #1377 (though we can reopen if the crash still happens)