Implement New Lock-Free Page Cache #140
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This was a bug because it mixes threading models; when adding a LRUClock::LocalCounter to the global list, it is very important that if the current thread must wait for the mutex, that when it resumes (with the lock held), it be on the _same_ thread, with the same thread_local variables, as when it blocked.
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To improve scalability of page loading/cache access.