Improve test #4408

Job	Run time
build-freebsd	16m 11s
build-msys	12m 53s
build-macos	5m 44s
build-distros (alpine)	17m 43s
build-multi-archs	19m 51s
build-distros (archlinux)	18m 30s
build-sanitizers	11m 2s
build-distros (debian:11)	12m 0s
build-windows	24m 31s
build-sanitizers (-DMOLD_USE_ASAN=On)	14m 32s
build-distros (fedora)	13m 12s
build-sanitizers (-DMOLD_USE_TSAN=On)	24m 32s
build-distros (gentoo/stage3)	20m 55s
build-distros (opensuse/tumbleweed)	14m 2s
build-distros (ubuntu:22.04)	11m 34s
	3h 57m 12s

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