Cherrypick PR 2060 to fix DateIntervalFormat

This is a regression in 71-1 on DateIntervalFormat

https://github.com/unicode-org/icu/pull/2060
https://unicode-org.atlassian.net/browse/ICU-21984

Bug: 1316665
Change-Id: Icd3b9e329ffd993457e1c2f0b86ed178f4a7b259
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/deps/icu/+/3587906
Reviewed-by: Jungshik Shin <jshin@chromium.org>
4 files changed