Improve performance by skipping char copies #4353

Job	Run time
build-macos	5m 36s
build-msys	11m 41s
build-freebsd	15m 40s
build-distros (alpine)	17m 26s
build-distros (archlinux)	18m 36s
build-multi-archs	19m 47s
build-windows	24m 51s
build-sanitizers	10m 29s
build-distros (debian:11)	11m 55s
build-sanitizers (-DMOLD_USE_ASAN=On)	14m 2s
build-distros (fedora)	12m 59s
build-sanitizers (-DMOLD_USE_TSAN=On)	24m 25s
build-distros (gentoo/stage3)	20m 23s
build-distros (opensuse/tumbleweed)	13m 18s
build-distros (ubuntu:22.04)	11m 17s
	3h 52m 25s

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