Use stop guards #1054

Job	Run time
macOS [UBSAN] [lmdb \| clang]	33m 0s
macOS [ASAN] [lmdb \| clang]	30m 35s
macOS [TSAN] [lmdb \| clang] (Errors Ignored)	29m 58s
Linux [UBSAN] [lmdb \| clang]	39m 0s
macOS [UBSAN] [rocksdb \| clang]	44m 27s
Linux [ASAN] [lmdb \| clang]	36m 13s
macOS [ASAN] [rocksdb \| clang]	40m 21s
Linux [ASAN_INT] [lmdb \| clang] (Errors Ignored)	39m 56s
macOS [TSAN] [rocksdb \| clang] (Errors Ignored)	55m 28s
Linux [TSAN] [lmdb \| clang] (Errors Ignored)	36m 33s
Linux [LEAK] [lmdb \| clang] (Errors Ignored)	36m 16s
Linux [UBSAN] [rocksdb \| clang]	45m 25s
Linux [ASAN] [rocksdb \| clang]	49m 2s
Linux [ASAN_INT] [rocksdb \| clang] (Errors Ignored)	49m 3s
Linux [TSAN] [rocksdb \| clang] (Errors Ignored)	1h 32m 48s
Linux [LEAK] [rocksdb \| clang] (Errors Ignored)	47m 45s
	11h 45m 50s

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