Simplify message visitor #1022

Job	Run time
Linux [UBSAN] [lmdb \| clang]	37m 22s
Linux [ASAN] [lmdb \| clang]	39m 45s
Linux [ASAN_INT] [lmdb \| clang] (Errors Ignored)	37m 59s
macOS [UBSAN] [lmdb \| clang]	34m 32s
Linux [TSAN] [lmdb \| clang] (Errors Ignored)	16m 12s
macOS [ASAN] [lmdb \| clang]	27m 18s
macOS [TSAN] [lmdb \| clang] (Errors Ignored)	31m 30s
Linux [LEAK] [lmdb \| clang] (Errors Ignored)	22m 51s
macOS [UBSAN] [rocksdb \| clang]	44m 4s
Linux [UBSAN] [rocksdb \| clang]	46m 17s
macOS [ASAN] [rocksdb \| clang]	41m 29s
Linux [ASAN] [rocksdb \| clang]	29m 59s
macOS [TSAN] [rocksdb \| clang] (Errors Ignored)	1h 3m 13s
Linux [ASAN_INT] [rocksdb \| clang] (Errors Ignored)	26m 12s
Linux [TSAN] [rocksdb \| clang] (Errors Ignored)	16m 26s
Linux [LEAK] [rocksdb \| clang] (Errors Ignored)	47m 42s
	9h 22m 51s

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