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

Fix bug 1417953 (buf_read_ahead_linear dereferences buffer page
pointer without protection).

Fix by protecting the bpage dereference with page hash S latch.

At the same time fix some other issues discovered while porting to
- remove unused buf_pool_mutex_key PFS instrumentation variable;
- remove zip mutex locking from buf_pool_watch_set and
  buf_pool_watch_remove, as the watch pages are already protected by
  page hash X latch;
- fix some comments;
- fix some bool variables getting assigned TRUE instead of true.

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