commit-reach: terminate merge-base walk when one side is exhausted #28806

Job	Run time
config	9s
fuzz smoke test	1m 43s
static-analysis	7m 24s
win+Meson build	4m 12s
win build	5m 18s
documentation	9m 45s
rust-analysis	1m 29s
osx-gcc (macos-14)	29m 20s
osx-reftable (macos-14)	37m 27s
osx-clang (macos-14)	40m 50s
sparse	3m 53s
linux-leaks (ubuntu:rolling)	42m 27s
linux-meson (ubuntu:rolling)	23m 58s
almalinux-8 (almalinux:8)	24m 6s
osx-meson (macos-14)	44m 20s
debian-11 (debian:11)	24m 12s
linux-reftable (ubuntu:rolling)	23m 21s
linux-musl-meson (alpine:latest)	22m 37s
linux-breaking-changes (ubuntu:rolling)	17m 7s
linux-reftable-leaks (ubuntu:rolling)	41m 42s
linux32 (i386/ubuntu:20.04)	6h 0m 6s
linux-sha256 (ubuntu:rolling)	27m 41s
linux-asan-ubsan (ubuntu:rolling)	55m 23s
linux-TEST-vars (ubuntu:20.04)	23m 13s
fedora-breaking-changes-meson (fedora:latest)	23m 24s
win+VS build	-1s
win+VS test	-1s
win+Meson test (6)	14m 39s
win+Meson test (0)	8m 41s
win+Meson test (4)	22m 6s
win+Meson test (5)	15m 6s
win+Meson test (3)	8m 38s
win+Meson test (1)	6m 20s
win+Meson test (9)	7m 23s
win+Meson test (2)	44m 29s
win+Meson test (8)	12m 9s
win+Meson test (7)	9m 1s
win test (3)	6m 50s
win test (5)	59m 52s
win test (9)	7m 11s
win test (4)	11m 52s
win test (6)	26m 39s
win test (8)	8m 33s
win test (2)	7m 2s
win test (1)	6m 33s
win test (0)	12m 23s
win test (7)	6m 10s
	19h 56m 42s

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