Can not use `babel-plugin-polyfill-regenerator` with `entry-global` method

#### This error occurs during the build process:
```
The "regenerator" provider doesn't support the "entry-global" polyfilling method.
```

But I see in the [README](https://github.com/babel/babel-polyfills/blob/main/packages/babel-plugin-polyfill-regenerator/README.md) that it says this method is supported.

Start with the linked babel-plugin-polyfill-regenerator README and reproduce the build using the entry-global method. Trace why the regenerator provider rejects that method, then verify that the implementation and README agree about whether entry-global is supported.

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