Instagram / IGListKit / 1654

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<a href="https://github.com/Instagram/IGListKit/commit/<a class=hub.com/Instagram/IGListKit/commit/<a class="double-link" href="https://git"><a class=hub.com/Instagram/IGListKit/commit/<a class="double-link" href="https://git"><a class=hub.com/Instagram/IGListKit/commit/<a class="double-link" href="https://git"><a class=hub.com/Instagram/IGListKit/commit/<a class="double-link" href="https://git"><a class=hub.com/Instagram/IGListKit/commit/<a class="double-link" href="https://git"><a class=hub.com/Instagram/IGListKit/commit/61c1524bb0c59d5eb43f65b02442ad50dfb2d0dc">61c1524bb<a href="https://github.com/Instagram/IGListKit/commit/61c1524bb0c59d5eb43f65b02442ad50dfb2d0dc">&quot;&gt;&amp;lt;a href=&amp;quot;https://github.com/Instagram/IGListKit/commit/&lt;/a&gt;&lt;a class=&quot;double-link&quot; href=&quot;https://github.com/Instagram/IGListKit/commit/&amp;lt;a class=&amp;quot;double-link&amp;quot; href=&amp;quot;https://git&quot;&gt;&amp;lt;a class=&lt;/a&gt;hub.com/Instagram/IGListKit/commit/&amp;lt;a class=&amp;quot;double-link&amp;quot; href=&amp;quot;https://git&quot;&gt;&amp;lt;a class=&lt;/a&gt;hub.com/Instagram/IGListKit/commit/&amp;lt;a class=&amp;quot;double-link&amp;quot; href=&amp;quot;https://git&quot;&gt;&amp;lt;a class=&lt;/a&gt;hub.com/Instagram/IGListKit/commit/61c1524bb0c59d5eb43f65b02442ad50dfb2d0dc&quot;&gt;61c1524bb&lt;/a&gt;&lt;a href=&quot;https://github.com/Instagram/IGListKit/commit/61c1524bb0c59d5eb43f65b02442ad50dfb2d0dc&quot;&gt;&amp;lt;a href=&amp;quot;https://github.com/Instagram/IGListKit/commit/61c1524bb0c59d5eb43f65b02442ad50dfb2d0dc&amp;quot;&amp;gt;&amp;amp;quot;&amp;amp;gt;&amp;amp;amp;lt;a href=&amp;amp;amp;quot;https://github.com/Instagram/IGListKit/commit/&amp;amp;lt;/a&amp;amp;gt;&amp;amp;lt;a class=&amp;amp;quot;double-link&amp;amp;quot; href=&amp;amp;quot;https://github.com/Instagram/IGListKit/commit/61c1524bb0c59d5eb43f65b02442ad50dfb2d0dc&amp;amp;quot;&amp;amp;gt;61c1524bb&amp;amp;lt;/a&amp;amp;gt;&amp;amp;lt;a href=&amp;amp;quot;https://github.com/Instagram/IGListKit/commit/61c1524bb0c59d5eb43f65b02442ad50dfb2d0dc&amp;amp;quot;&amp;amp;gt;&amp;amp;amp;quot;&amp;amp;amp;gt;Add experiment for reloadData on large changesets

Summary:
Preparing another perf test. I noticed in some surfaces that have **massive** updates (8k+ inserts/deletes) that perf can be pretty awful. This is all due to internals of `UICollectionView` trying to create cells and animate a huge blob of changes. Instead, I&amp;amp;amp;amp;#39;m picking a sensible (is it?) default to just skip batch updates and do `reloadData` instead.

Unit tests caught that the `layoutIfNeeded` is required to immediately configure cells.

Depends on D5392713

Reviewed By: jeremycohen

Differential Revision: D5392882

fbshipit-source-id: &amp;amp;lt;/a&amp;amp;gt;&amp;amp;lt;a class=&amp;amp;quot;double-link&amp;amp;quot; href=&amp;amp;quot;https://github.com/Instagram/IGListKit/commit/&amp;lt;/a&amp;gt;&amp;lt;a class=&amp;quot;double-link&amp;quot; href=&amp;quot;http</a>s://github.com/Instagram/IGListKit/commit/</a><a class="double-link" href="https://github.com/Instagram/IGListKit/commit/<a class="double-link" href="https://github.com/Instagram/IGListKit/commit/e429ddb7bca7400908898ebc6f097a489211b03d">e429ddb7b</a>">e429ddb7b</a>">e429ddb7b</a><a href="https://github.com/Instagram/IGListKit/commit/61c1524bb0c59d5eb43f65b02442ad50dfb2d0dc">">e429ddb7b</a>

10216 of 10470 relevant lines covered (97.57%)

884.73 hits per line