dillon1000/react

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Use `isAncestorIDOf` in `ReactInstanceHandles`

This is both a functional fix and performance fix for `ReactInstanceHandles`.

 - `getFirstReactDOM` uses `indexOf` but should be checking ancestry (via `isMarker()`).
 - Added `isAncestorIDOf`, checking ancestry can be way faster than getting a common ancestor: http://jsperf.com/react-ancestor-id-check
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CommitSyncScript authored 93f979ae18c9decabd378c33a45cda21c92765ec Parent ca3f871
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M src/core/ReactInstanceHandles.js ModifiedM src/core/__tests__/ReactInstanceHandles-test.js Modified
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