tree b5305ff1fd8823313d6852f5cc9ab97efae4ee5f
parent 395858288bfa4280de5101e066847f8bf5c37852
author Urvang Joshi <urvang@google.com> 1541726024 -0800
committer Urvang Joshi <urvang@google.com> 1541811391 -0800

Clarify indexing in [lr]shift_bdw_ref_frames().

Also clarify some comments.

Based on suggestions in:
https://aomedia-review.googlesource.com/c/aom/+/74481

BUG=aomedia:2230

Change-Id: I18b7e03b76e0cda76815fc370c4f74ebc8dcf723