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MDEV-28525 Some conditions around btr_latch_mode could be eliminated
The types btr_latch_mode and mtr_memo_type_t are partly derived from rw_lock_type_t. Despite that, some code for converting between them is using conditions instead of bitwise arithmetics. Let us define btr_latch_mode in such a way that more conversions to rw_lock_type_t are possible by bitwise and. Some SPATIAL INDEX code that assumed !(BTR_MODIFY_TREE & BTR_MODIFY_LEAF) was adjusted.
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