facebook / react / 13489

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Fix resuming bug

If we abort work but have some completed, we can bail out if
the shouldComponentUpdate returns true. However, then we have
a tree that is low priority. When we bailout we currently use
the "current" tree in this case. I don't think this is right.
I'm not sure why I did that.

Similarly, when we complete we use the "current" props if we
didn't have pending props to do. However, we should be using
the memoized props of that tree if it is a pending work tree.

Added a unit test that covers these two cases.

1 of 1 new or added line in 1 file covered. (100.0%)

7899 of 9012 relevant lines covered (87.65%)

3172.83 hits per line