Buffer pool mutex split for 5.6

Registered by Laurynas Biveinis

Preliminary benchmarks showed that the 5.6 buffer pool locking and flushing improvements did not remove the need for the buffer pool mutex patch. Thus there is need to port the buffer pool mutex split to 5.6. At the same time it is possible to further improve the split to the point of removing buffer_pool->mutex remnants that protect buffer pool stats and flush states.



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