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+ preserve promotion for synthetic variables. Closes #40255 Change-Id: I2ebe43c31a05ff0121d971205bf8ff5f0e084113 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/134161 Reviewed-by: Dmitry Stefantsov <dmitryas@google.com> Commit-Queue: Johnni Winther <johnniwinther@google.com>