[cfe] Fix kernel (de-)serialization missing field offset on FieldInitializer. We are experiencing diffs in Dart2JS source maps in `--test-mode` which does a serialization round trip. JS that should map to default parameters is instead mapping to the surrounding `Constructor` member since the FieldInitializer's offset is getting dropped. This is affecting any Dart2JS split action build since those all end of serialiaing and deserializing the kernel. Any other tools using this serialization would also be affected. TEST=Existing/will add in follow up. Bug: https://github.com/dart-lang/sdk/issues/53466 Change-Id: Ibeccf9153c78e6c358806c7ded4dbc2dea49d8e6 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/325020 Commit-Queue: Nate Biggs <natebiggs@google.com> Reviewed-by: Alexander Markov <alexmarkov@google.com> Reviewed-by: Johnni Winther <johnniwinther@google.com>
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