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Add a method that provides efficiently querying for which member field in a oneof is actually set. This is useful when dealing with oneofs with many member fields. Change-Id: I918b566c432f8bdd24dcecbb5501d231ffefef29 Reviewed-on: https://go-review.googlesource.com/c/protobuf/+/170580 Reviewed-by: Damien Neil <dneil@google.com>