check functions for Function ctor
check functions for Function ctor

Summary: Examples, so that we may observe what native code the compiler emits for the `Function` constructor.

Reviewed By: luciang

Differential Revision: D35624590

fbshipit-source-id: 034c7b7cd86cf69bc22968bdd7e58da6c7b8e650

facebook/folly,facebook/folly,facebook/folly,facebook/folly,facebook/folly