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Core: remove ConcurrentHashMapV8 #7296
In #6400 we pulled in a snapshot of CHM V8 to reduce RAM overhead, notable for the live version map.
But I think this is actually quite risky going forward .. the implementation in the OpenJDK has already changed quite a bit since Doug Lea's version, and it's risky if we don't pull in bug fixes.
I think we should just revert back to the JVM's implementation? Users can upgrade to Java 8 to reduce RAM usage ... I think this means we need to conditionalize the RAM usage logic in LiveVersionMap.