Speed up `Hash#transform_values` when empty
We're calling this function on an empty hash as part of copying the attribute set during dirty checking initialization. The new structure caused a performance regression on loading records from the database. This causes `User.all.to_a` to perform about 10% faster w/ 10k records. Calculating ------------------------------------- User.all - master 9.000 i/100ms User.all - sg-fix-ar-regression 8.000 i/100ms ------------------------------------------------- User.all - master 81.236 (± 7.4%) i/s - 405.000 User.all - sg-fix-ar-regression 89.716 (± 7.8%) i/s - 448.000
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