commit-reach: use object flags for tips_reachable_from_bases() #27815

Job	Run time
config	9s
fuzz smoke test	1m 17s
win build	5m 8s
win+Meson build	4m 41s
sparse	3m 35s
rust-analysis	1m 29s
static-analysis	6m 23s
win+VS build	0s
documentation	7m 13s
osx-gcc (macos-14)	17m 39s
osx-meson (macos-14)	20m 3s
osx-clang (macos-14)	16m 6s
osx-reftable (macos-14)	16m 46s
linux-reftable (ubuntu:rolling)	10m 59s
fedora-breaking-changes-meson (fedora:latest)	8m 53s
linux-breaking-changes (ubuntu:rolling)	10m 58s
linux32 (i386/ubuntu:focal)	10m 27s
linux-reftable-leaks (ubuntu:rolling)	30m 8s
linux-TEST-vars (ubuntu:20.04)	10m 44s
linux-leaks (ubuntu:rolling)	24m 34s
linux-meson (ubuntu:rolling)	13m 54s
linux-sha256 (ubuntu:rolling)	12m 49s
almalinux-8 (almalinux:8)	8m 59s
linux-asan-ubsan (ubuntu:rolling)	35m 34s
linux-musl-meson (alpine:latest)	7m 50s
debian-11 (debian:11)	8m 59s
win+VS test	0s
win+Meson test (2)	10m 14s
win+Meson test (3)	6m 22s
win+Meson test (1)	10m 43s
win+Meson test (8)	8m 4s
win+Meson test (9)	6m 55s
win+Meson test (6)	10m 49s
win+Meson test (7)	6m 38s
win+Meson test (4)	6m 44s
win+Meson test (0)	9m 45s
win+Meson test (5)	9m 15s
win test (1)	9m 20s
win test (8)	6m 9s
win test (3)	9m 14s
win test (2)	6m 53s
win test (7)	7m 20s
win test (6)	5m 45s
win test (9)	7m 0s
win test (0)	8m 15s
win test (5)	8m 23s
win test (4)	8m 11s
	7h 37m 16s

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