Diogo Franco 452f8f150c Always use the native (or polyfilled) Promise in transform-async-to-generator (#5536)
* Always use the native (or polyfilled) Promise in transform-async-to-generator

Fixes #5531

* Simplify scope handling to only un-shadow the Program's Promise

Only the helper needs to see the native Promise.
2017-04-06 11:17:31 -04:00
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