dillon1000/react

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Memoize merged child context when possible

We can avoid recreating the merged context object if the context provider work was reused. This is essential to avoid allocations for deep setState() calls.
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Dan Abramov authored a6ee5b876a90e87efe9fe2f3605bef9347fa4327 Parent 299009c
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M src/renderers/shared/fiber/ReactFiberContext.js ModifiedM src/renderers/shared/fiber/__tests__/ReactIncremental-test.js Modified
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