Refactor #4258

Job	Run time
build-freebsd	16m 3s
build-macos	4m 39s
build-distros (alpine)	17m 20s
build-distros (archlinux)	19m 5s
build-msys	12m 3s
build-multi-archs	20m 43s
build-distros (fedora)	12m 58s
build-sanitizers	10m 47s
build-sanitizers (-DMOLD_USE_ASAN=On)	14m 55s
build-distros (gentoo/stage3)	22m 34s
build-windows	24m 57s
build-sanitizers (-DMOLD_USE_TSAN=On)	24m 25s
build-distros (opensuse/tumbleweed)	14m 23s
build-distros (ubuntu:22.04)	11m 59s
	3h 46m 51s

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