Refactor #4113

Job	Run time
build-gcc	18m 49s
build-clang (-DCMAKE_DISABLE_PRECOMPILE_HEADERS=On)	11m 41s
build-distros (alpine)	14m 43s
build-clang (-DMOLD_USE_TSAN=On)	17m 56s
build-macos (-DCMAKE_DISABLE_PRECOMPILE_HEADERS=On)	7m 25s
build-distros (archlinux)	16m 37s
build-msys	10m 44s
build-macos (-DMOLD_USE_ASAN=On)	18m 57s
build-distros (fedora)	11m 56s
build-windows	28m 20s
build-distros (gentoo/stage3)	17m 39s
build-distros (opensuse/tumbleweed)	11m 33s
	3h 6m 20s

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