Eliminate old plain array notices
Summary:
D23588960 (https://github.com/facebook/hhvm/commit/
28a51932dc5004e489ddedfbda358a77e2bf4057) was a nice simplification of array comparisons, but it pushed vec <= vec through ArrayData::CompareHelper, which was previously only intended to compare PHP arrays. For the most part, this helper compares vecs correctly, but executing it on Hack arrays triggers notices about "plain arrays", which we eliminated about six months ago. Delete these notices.
Reviewed By: colavitam
Differential Revision:
D26374829
fbshipit-source-id:
3e5ab5cdd6efd2d4728d55c02fcee23ea7973cd6