Created by Laurynas Biveinis and last modified
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484. By Laurynas Biveinis

Split an LRU manager thread out of the page cleaner thread,

Declare new thread entry point buf_lru_manager_thread(). Move LRU
flushing-related code from buf_flush_page_cleaner_thread(). Spawn
this thread from innobase_start_or_create_for_mysql().

Revert the change that was needed by
in buf_flush_ready_for_flush() and allow flush list flushing of
latched pages again.

Introduce a new flag buf_lru_manager_is_active that is used instead of
buf_page_cleaner_is_active by buf_LRU_get_free_block().

Adjust innodb_sched_priority_cleaner_update() to set the priority for
both cleaner and LRU manager threads.

Define a PFS key for the new thread. Re-record
perfschema.threads_innodb testcase.

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