Fix divergent equals and hashCode behavior

Calling Objects.hash with a byte[] will call the identity hashCode on the
byte[] (data, data_mask) and this doesn't agree with the use of
Objects.deepEquals in equals.
Bug caught by error prone.

Bug: 27723540
Change-Id: Ic33f9a341165db6c9339321f81f7af63d627a2cb
1 file changed