9b924765f Improve performance of Locale.toString (flutter/engine#7990) (#28623)

https://github.com/flutter/engine/compare/3e4e6f5c54db...9b924765f4de

git log 3e4e6f5c54db7a705e6d50f7f3bddfa2ac0d6612..9b924765f4de29cb9751eb598a629f0cc8d4975b --no-merges --oneline
9b924765f Improve performance of Locale.toString (flutter/engine#7990)

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