Refactor #4169

Job	Run time
build-freebsd	18m 12s
build-macos	6m 16s
build-msys	11m 38s
build-distros (alpine)	15m 3s
build-multi-archs	14m 35s
build-distros (archlinux)	17m 21s
build-sanitizers	9m 36s
build-windows	29m 0s
build-distros (fedora)	11m 58s
build-sanitizers (-DMOLD_USE_ASAN=On)	12m 51s
build-sanitizers (-DMOLD_USE_TSAN=On)	22m 44s
build-distros (gentoo/stage3)	18m 6s
build-distros (opensuse/tumbleweed)	12m 28s
build-distros (ubuntu:22.04)	10m 41s
	3h 30m 29s

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