Refactor #4403

Job	Run time
build-macos	4m 27s
build-macos	4m 27s
build-multi-archs	19m 55s
build-multi-archs	19m 55s
build-sanitizers	10m 32s
build-sanitizers	10m 32s
build-distros (alpine)	5m 50s
build-distros (alpine)	17m 47s
build-sanitizers (-DMOLD_USE_ASAN=On)	14m 8s
build-sanitizers (-DMOLD_USE_ASAN=On)	14m 8s
build-windows	24m 42s
build-windows	24m 42s
build-distros (archlinux)	53s
build-distros (archlinux)	18m 34s
build-sanitizers (-DMOLD_USE_TSAN=On)	24m 33s
build-sanitizers (-DMOLD_USE_TSAN=On)	24m 33s
build-freebsd	15m 44s
build-freebsd	15m 44s
build-distros (debian:11)	53s
build-distros (debian:11)	12m 2s
build-msys	12m 7s
build-msys	12m 7s
build-distros (fedora)	52s
build-distros (fedora)	13m 4s
build-distros (gentoo/stage3)	59s
build-distros (gentoo/stage3)	21m 25s
build-distros (opensuse/tumbleweed)	47s
build-distros (opensuse/tumbleweed)	13m 16s
build-distros (ubuntu:22.04)	52s
build-distros (ubuntu:22.04)	11m 34s
	6h 11m 4s

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