Nathan Shively-Sanders 7c397f7a65 Infer from arrows from usage. (#28832)
* Infer from arrows from usage.

Previously only function expressions were, and only those with an easily
accessible name. Now any arrow function or function expression will
infer from usage.

* remove isApplicableFunctionForInference

*all* functions are applicable for inference now.
2018-12-04 09:03:56 -08:00
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