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6eebed0535
Prior to this, React was using a nextDebugID variable that was locally scoped to both `instantiateReactComponent` and `ReactShallowRenderer`. This caused problems when the debugIDs would collide, the `itemMap` in `ReactComponentTreeHook` would be overwritten and tests would fail with the message "Expected onBeforeMountComponent() parent and onSetChildren() to be consistent". This change shares the debugID with both modules thus preventing any collisions in the future.