fix: concurrent access may cause an java.lang.ClassCastException #864
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By chance I encountered in the Jadx log several java.lang.ClassCastException java.util.HashMap$Node cannot be cast to java.util.HashMap$TreeNode in
JNodeCache.makeFrom().Based on some research this can happen in case the HashMap is accesses concurrently.
This seem to happen very very rarely as I wasn't able to reproduce this Exception in my further tests.
Nevertheless one time if failed and therefore I would suggest to better to use a ConcurrentHashMap for the JNodeCache.