Remove some unused nonsense

Summary: These blocks do nothing. end() produces a side effect on the internal
array pointer, but the code does not depend on it.

Test Plan: Reasoned about the code? Also viewed some diffs.

Reviewers: vrana, btrahan, jungejason

Reviewed By: vrana

CC: aran

Differential Revision: https://secure.phabricator.com/D1432