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MDEV-34458 wait_for_read in buf_page_get_low hurts performance
BTR_MODIFY_PREV: Remove. This mode was only used by the change buffer, which commit f27e9c8 (MDEV-29694) removed. buf_page_get_gen(): Revert the change that was made in commit 90b95c6 (MDEV-33543) because it is not applicable after MDEV-29694. This fixes the performance regression that Vladislav Vaintroub reported. This is a 11.x specific fix; this needs to be fixed differently in older major versions where the change buffer is present.
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