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ext/standard/md5: Minor refactorings (#18518) #798

Job	Run time
MACOS_${{ matrix.arch }}_DEBUG_NTS	-1s
LINUX_X64_${{ matrix.debug && 'DEBUG' \|\| 'RELEASE' }}_${{ matrix.zts && 'ZTS' \|\| 'NTS' }}${{ matrix.asan && '_ASAN' \|\| '' }}	-1s
BENCHMARKING	-1s
WINDOWS_X64_ZTS	-1s
LINUX_X32_DEBUG_ZTS	-1s
FREEBSD	-10s
	-15s

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