Optimize cemented callbacks #1975

Job	Run time
macOS [UBSAN] [lmdb \| clang]	33m 27s
Linux [UBSAN] [lmdb \| clang]	38m 56s
macOS [ASAN] [lmdb \| clang]	28m 2s
Linux [ASAN] [lmdb \| clang]	38m 7s
macOS [TSAN] [lmdb \| clang]	31m 19s
Linux [ASAN_INT] [lmdb \| clang] (Errors Ignored)	38m 19s
macOS [UBSAN] [rocksdb \| clang]	37m 35s
Linux [TSAN] [lmdb \| clang]	37m 40s
macOS [ASAN] [rocksdb \| clang]	37m 8s
Linux [LEAK] [lmdb \| clang] (Errors Ignored)	37m 43s
macOS [TSAN] [rocksdb \| clang]	46m 55s
Linux [UBSAN] [rocksdb \| clang]	44m 21s
Linux [ASAN] [rocksdb \| clang]	47m 53s
Linux [ASAN_INT] [rocksdb \| clang] (Errors Ignored)	49m 8s
Linux [LEAK] [rocksdb \| clang] (Errors Ignored)	50m 39s
	9h 57m 12s

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