Use per-message CodedInputStreams in the verifier
Use per-message CodedInputStreams in the verifier

Summary:
This partially addresses T131.

CodedInputStream uses a 32-bit signed integer to
count the total number of bytes it's read. Sometimes
we have streams longer than the biggest 32-bit
signed integer, so we have to use multiple streams.

Reviewers: #core_team, shahms

Reviewed By: #core_team, shahms

Maniphest Tasks: T131

Differential Revision: https://phabricator-dot-kythe-repo.appspot.com/D1112

bzz/kythe,kythe/kythe,legrosbuffle/kythe,bzz/kythe,bzz/kythe,legrosbuffle/kythe,benjyw/kythe,benjyw/kythe,kythe/kythe,legrosbuffle/kythe,kythe/kythe,bzz/kythe,benjyw/kythe,bzz/kythe,legrosbuffle/kythe,benjyw/kythe,bzz/kythe,bzz/kythe,benjyw/kythe,kythe/kythe,kythe/kythe,kythe/kythe,kythe/kythe,benjyw/kythe,kythe/kythe,legrosbuffle/kythe,kythe/kythe,legrosbuffle/kythe,bzz/kythe,benjyw/kythe,legrosbuffle/kythe,kythe/kythe,kythe/kythe,bzz/kythe,legrosbuffle/kythe,bzz/kythe,benjyw/kythe,bzz/kythe,legrosbuffle/kythe,benjyw/kythe,legrosbuffle/kythe,bzz/kythe,benjyw/kythe,benjyw/kythe,legrosbuffle/kythe,benjyw/kythe