Rolling v8/third_party/icu: https://chromium.googlesource.com/chromium/deps/icu/+log/1da9170..50ec7b3

CherryPick PR2117 to avoid assert on invalid state (Frank Tang)
https://chromium.googlesource.com/chromium/deps/icu/+/50ec7b3

R=v8-waterfall-sheriff@grotations.appspotmail.com,mtv-sf-v8-sheriff@grotations.appspotmail.com,ftang@chromium.org

Change-Id: I7d5adea35e71e05537a3059241410e8536101021
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3723786
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