abitidy: Add method to calculate new ids for anonymous types

This method only considers the kind of the anonymous types to renumber
ids for now. It will be developed further in the following changes to
consider the information about the data members to of the anonymous type
in order to renumber them.

Bug: 239910948
Signed-off-by: Sid Nayyar <sidnayyar@google.com>
Change-Id: I724bad71fc0b16c2a28c67b9cea86678fcb8e339
1 file changed