Moving block successors to their own table. #1280

Job	Run time
Linux [UBSAN] [lmdb \| clang]	42m 1s
Linux [ASAN] [lmdb \| clang]	38m 57s
Linux [ASAN_INT] [lmdb \| clang] (Errors Ignored)	37m 51s
macOS [UBSAN] [lmdb \| clang]	28m 38s
Linux [TSAN] [lmdb \| clang] (Errors Ignored)	36m 39s
macOS [ASAN] [lmdb \| clang]	26m 10s
Linux [LEAK] [lmdb \| clang] (Errors Ignored)	36m 50s
macOS [TSAN] [lmdb \| clang] (Errors Ignored)	26m 55s
Linux [UBSAN] [rocksdb \| clang]	44m 48s
macOS [UBSAN] [rocksdb \| clang]	37m 46s
Linux [ASAN] [rocksdb \| clang]	48m 12s
macOS [ASAN] [rocksdb \| clang]	34m 56s
macOS [TSAN] [rocksdb \| clang] (Errors Ignored)	48m 8s
Linux [ASAN_INT] [rocksdb \| clang] (Errors Ignored)	49m 13s
Linux [TSAN] [rocksdb \| clang] (Errors Ignored)	1h 33m 10s
Linux [LEAK] [rocksdb \| clang] (Errors Ignored)	47m 49s
	11h 18m 3s

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