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* Add iterable cases to MultiChildReconcile test Stack currently supports rendering iterables, but Fiber does not. Previously we didn't have any public API tests for iterables. We have tests for traverseAllChildren() which is shared between React.Children and Stack. However Fiber doesn't currently use it, and likely won't. So this commit is a first step towards actually testing iterable support via public API. The next step will be to port traverseAllChildren() tests to test React.Children API instead. * Implement iterable reconciliation in Fiber This uses the same exact algorithm as array reconciliation but uses iterator to step through. This gets reconcile tests to pass again but introduces a regression in ReactMultiChildText case which uses Maps as children. It passed before because Maps were ignored, but now it's failing because this actually runs the Map code path in Fiber. We can throw early in this case when we want to follow up on this. * Rewrite traverseAllChildren() tests against React.Children API This function was used in React.Children and Stack. The corresponding reconciliation functionality is being tested by ReactMultiChild tests. So we can move these tests to ReactChildren and test its public API.