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429. By Laurynas Biveinis

Fix bug 1227581 (InnoDB: Failing assertion: buf_page_in_file(bpage) in
file buf0flu.cc line 2674 | abort (sig=6) in
buf_pool_get_dirty_pages_count on ALTER TABLE).

The issue is that buf_LRU_free_page() may perform a flush list
relocation for a dirty zip page, making it possible to observe a page
in BUF_BLOCK_REMOVE_HASH state on the flush list between
buf_LRU_block_remove_hashed() and buf_flush_relocate_on_flush_list()
calls, if another thread reads flush list pages without the LRU list

Places where a thread iterates through the flush list without the LRU
list mutex and does not expect to see a BUF_BLOCK_REMOVE_HASH page are
buf_pool_get_dirty_pages_count(), buf_do_flush_list_batch(), and
buf_get_latched_pages_number_instance(). The fix is to accept such
pages there:
- in buf_pool_get_dirty_pages_count() check such page as if it were
- in buf_flush_page_and_try_neighbors(), called from
  buf_do_flush_list_batch(), do not attempt to flush such page.
- in buf_flush_set_hp(), also called from buf_do_flush_list_batch(),
  allow setting hazard pointer on such page.
- in buf_get_latched_pages_number_instance(), silently accept such

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