dillon1000/react

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Measure time between scheduling an async callback and flushing it (#11506)

* Measure time between scheduling an async callback and flushing it

Helps detect starvation issues.

* Debug comments should print directly above the next measure

* Better warning message

Most users won't know what "expires" means
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M packages/react-reconciler/src/ReactDebugFiberPerf.js ModifiedM packages/react-reconciler/src/ReactFiberScheduler.js ModifiedM packages/react-reconciler/src/__tests__/ReactIncrementalPerf-test.js ModifiedM packages/react-reconciler/src/__tests__/__snapshots__/ReactIncrementalPerf-test.js.snap Modified
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