Simplify message visitor #1013

Job	Run time
macOS [UBSAN] [lmdb \| clang]	32m 49s
Linux [UBSAN] [lmdb \| clang]	36m 29s
macOS [ASAN] [lmdb \| clang]	29m 40s
Linux [ASAN] [lmdb \| clang]	15m 14s
macOS [TSAN] [lmdb \| clang] (Errors Ignored)	29m 23s
Linux [ASAN_INT] [lmdb \| clang] (Errors Ignored)	36m 45s
macOS [UBSAN] [rocksdb \| clang]	36m 28s
Linux [TSAN] [lmdb \| clang] (Errors Ignored)	13m 13s
macOS [ASAN] [rocksdb \| clang]	37m 50s
Linux [LEAK] [lmdb \| clang] (Errors Ignored)	22m 48s
macOS [TSAN] [rocksdb \| clang] (Errors Ignored)	51m 47s
Linux [UBSAN] [rocksdb \| clang]	43m 5s
Linux [ASAN] [rocksdb \| clang]	46m 35s
Linux [ASAN_INT] [rocksdb \| clang] (Errors Ignored)	13m 20s
Linux [TSAN] [rocksdb \| clang] (Errors Ignored)	12m 50s
Linux [LEAK] [rocksdb \| clang] (Errors Ignored)	48m 53s
	8h 27m 9s

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