optimize lookups in snapshot [sub]xip arrays

When Who What
2022-08-11 04:13:45 John Naylor (john.naylor) Closed in commitfest 2022-09 with status: Committed
2022-08-10 21:42:51 Nathan Bossart (bossartn) Changed committer to john.naylor
2022-07-24 04:51:35 Mingli Zhang (zml) Added zml as reviewer
2022-07-13 20:51:27 Nathan Bossart (bossartn) Changed authors to Nathan Bossart (bossartn)
2022-07-13 20:51:27 Nathan Bossart (bossartn) Changed targetversion to 16
2022-07-13 20:51:17 Nathan Bossart (bossartn) Attached mail thread 20220713170950.GA3116318@nathanxps13
2022-07-13 20:51:17 Nathan Bossart (bossartn) Created patch record