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MDEV-22849 Reuse skip_trailing_space() in my_hash_sort_utf8mbX
Replacing the slow loop in my_hash_sort_utf8mbX() to the fast skip_trailing_spaces(), which consumes 8 bytes in one iteration, and is around 8 times faster on long data. Also, renaming: - my_hash_sort_utf8() to my_hash_sort_utf8mb3() - my_hash_sort_utf8_nopad() to my_hash_sort_utf8mb3_nopad() to merge to 10.5 easier (automatically?).
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