commit-reach: terminate merge-base walk when one side is exhausted #28805

Job	Run time
config	11s
fuzz smoke test	1m 20s
rust-analysis	1m 29s
static-analysis	6m 1s
win build	5m 5s
documentation	8m 8s
sparse	3m 57s
osx-reftable (macos-14)	29m 24s
osx-meson (macos-14)	32m 7s
osx-clang (macos-14)	28m 53s
win+Meson build	4m 18s
linux-musl-meson (alpine:latest)	18m 12s
osx-gcc (macos-14)	31m 38s
linux32 (i386/ubuntu:20.04)	33m 12s
linux-TEST-vars (ubuntu:20.04)	23m 36s
linux-breaking-changes (ubuntu:rolling)	23m 18s
almalinux-8 (almalinux:8)	20m 35s
debian-11 (debian:11)	21m 23s
linux-sha256 (ubuntu:rolling)	16m 56s
linux-asan-ubsan (ubuntu:rolling)	33m 12s
linux-leaks (ubuntu:rolling)	27m 35s
linux-reftable-leaks (ubuntu:rolling)	33m 12s
win+VS build	0s
linux-meson (ubuntu:rolling)	23m 52s
fedora-breaking-changes-meson (fedora:latest)	18m 1s
linux-reftable (ubuntu:rolling)	27m 7s
win+VS test	0s
win+Meson test (8)	11m 34s
win+Meson test (7)	7m 27s
win+Meson test (3)	8m 6s
win+Meson test (0)	9m 0s
win+Meson test (4)	14m 57s
win+Meson test (6)	13m 47s
win+Meson test (1)	7m 0s
win+Meson test (9)	6m 21s
win+Meson test (5)	14m 22s
win+Meson test (2)	15m 7s
win test (7)	6m 21s
win test (8)	7m 53s
win test (3)	7m 26s
win test (2)	5m 33s
win test (4)	6m 10s
win test (9)	5m 41s
win test (5)	8m 44s
win test (0)	10m 59s
win test (1)	5m 55s
win test (6)	6m 37s
	10h 51m 42s

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