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MDEV-32757 innodb_undo_log_truncate=ON is not crash safe
trx_purge_truncate_history(): Do not prematurely mark dirty pages as clean. This will be done in mtr_t::commit_shrink() as part of Shrink::operator()(mtr_memo_slot_t*). Also, register each dirty page only once in the mini-transaction. fsp_page_create(): Adjust and simplify the page creation during undo tablespace truncation. We can directly reuse pages that are already in buf_pool.page_hash. This fixes a regression that was caused by commit f5794e1 (MDEV-26445). Tested by: Matthias Leich Reviewed by: Thirunarayanan Balathandayuthapani
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