R1:4d7b44183425

Don't skip even lines in copied code detector

Summary: PHP 3 basics: `each()` advances internal pointer so calling `next()` is wrong.

Test Plan: New test.

Reviewers: epriestley

Reviewed By: epriestley

CC: aran, Korvin

Differential Revision: https://secure.phabricator.com/D4011