dillon1000/react

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Fix DEV performance regression by avoiding Object.assign on Fibers (#12510)

* Fix DEV performance regression by avoiding Object.assign on Fibers

* Reduce allocations in hot path by reusing the stash

Since performUnitOfWork() is not reentrant, it should be safe to reuse the same stash every time instead of creating a new object.
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Dan Abramov authored 59dac9d7a6a2f0b66003cf717d71b5587265423f Parent 0c80977
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M packages/react-reconciler/src/ReactFiber.js ModifiedM packages/react-reconciler/src/ReactFiberScheduler.js ModifiedA packages/react-reconciler/src/__tests__/ReactIncrementalErrorReplay-test.internal.js Added
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