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Most bots' xcode were upgraded to 11c29 in crrev.com/c/2028249.
However, we tell swarming to persist only the xcode located in
11a1027, so the new xcode located in 11c29 isn't getting persisted.
Consequently every build does a fresh download of xcode, which
leads to a 20+ min download time:
https://luci-milo.appspot.com/p/chromium/builders/try/ios-simulator/473405

This should fix that.

Bug: 1048301, 1041618
Change-Id: Ie610497b6c40edb66021fa7fe55676cbf96fb8f0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2036443
Auto-Submit: Ben Pastene <bpastene@chromium.org>
Commit-Queue: John Budorick <jbudorick@chromium.org>
Reviewed-by: John Budorick <jbudorick@chromium.org>
Cr-Commit-Position: refs/heads/master@{#738009}