Dedicated `rep_tiers` class #891

Job	Run time
macOS [UBSAN] [lmdb \| clang]	31m 9s
Linux [UBSAN] [lmdb \| clang]	36m 56s
macOS [ASAN] [lmdb \| clang]	28m 50s
Linux [ASAN] [lmdb \| clang]	35m 27s
macOS [TSAN] [lmdb \| clang] (Errors Ignored)	30m 25s
Linux [ASAN_INT] [lmdb \| clang] (Errors Ignored)	37m 35s
macOS [UBSAN] [rocksdb \| clang]	39m 28s
Linux [TSAN] [lmdb \| clang] (Errors Ignored)	37m 54s
Linux [LEAK] [lmdb \| clang] (Errors Ignored)	36m 36s
macOS [ASAN] [rocksdb \| clang]	34m 50s
Linux [UBSAN] [rocksdb \| clang]	42m 6s
macOS [TSAN] [rocksdb \| clang] (Errors Ignored)	50m 9s
Linux [ASAN] [rocksdb \| clang]	45m 54s
Linux [ASAN_INT] [rocksdb \| clang] (Errors Ignored)	49m 56s
Linux [TSAN] [rocksdb \| clang] (Errors Ignored)	1h 35m 15s
Linux [LEAK] [rocksdb \| clang] (Errors Ignored)	45m 47s
	11h 18m 17s

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