commit-reach: terminate merge-base walk when one side is exhausted #29011

Job	Run time
config	9s
fuzz smoke test	1m 49s
win+Meson build	4m 9s
static-analysis	6m 38s
rust-analysis	1m 53s
documentation	7m 25s
sparse	3m 43s
win build	5m 11s
osx-meson (macos-14)	35m 17s
osx-clang (macos-14)	42m 10s
osx-reftable (macos-14)	21m 36s
osx-gcc (macos-14)	34m 15s
fedora-breaking-changes-meson (fedora:latest)	16m 20s
linux-breaking-changes (ubuntu:rolling)	18m 54s
linux-reftable-leaks (ubuntu:rolling)	56m 47s
linux-meson (ubuntu:rolling)	21m 19s
linux-musl-meson (alpine:latest)	16m 11s
linux-asan-ubsan (ubuntu:rolling)	1h 0m 49s
linux-leaks (ubuntu:rolling)	55m 58s
almalinux-8 (almalinux:8)	12m 30s
linux-sha256 (ubuntu:rolling)	19m 30s
linux32 (i386/ubuntu:20.04)	13m 27s
linux-reftable (ubuntu:rolling)	17m 56s
linux-TEST-vars (ubuntu:20.04)	17m 42s
debian-11 (debian:11)	15m 43s
win+VS build	0s
win+VS test	-1s
win+Meson test (7)	5m 40s
win+Meson test (2)	14m 47s
win+Meson test (0)	11m 14s
win+Meson test (1)	34m 52s
win+Meson test (5)	9m 40s
win+Meson test (3)	9m 9s
win+Meson test (8)	6m 24s
win+Meson test (4)	7m 39s
win+Meson test (6)	10m 25s
win+Meson test (9)	8m 1s
win test (6)	10m 22s
win test (9)	9m 21s
win test (1)	8m 11s
win test (0)	12m 6s
win test (7)	8m 6s
win test (4)	11m 18s
win test (8)	15m 15s
win test (2)	7m 21s
win test (5)	7m 54s
win test (3)	10m 18s
	12h 5m 23s

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