Replace some begin/rbegin usage with front/back #525

Job	Run time
Android	2m 5s
Linux-musl (x86_64-linux-musl)	53s
Linux-musl (aarch64-linux-musl)	1m 19s
Mac-os	1m 9s
Linux-musl-apicheck (x86_64-linux-musl)	1m 3s
Mac-os-aarch64	1m 4s
Mac-os-cctools	1m 55s
Mac-os-aarch64-cctools	2m 1s
Windows	2m 5s
Mac-os-universal	14s
Mac-os-universal-cctools	10s
Notify-success	4s
	14m 2s

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