Handle circular dependency upon dependency removal#506

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raejin wants to merge 7 commits intofacebook:masterfrom raejin:fix-dependency-removal-bug-when-circular-dependency-happens

Commits on Jan 3, 2020

When removing a dependency, we don't abort removal only because its
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Commits on Jan 6, 2020

address comment
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Commits on Jan 16, 2020

Due to performance bug with the previous implementation, I implemented a
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