dillon1000/react

[hir] Attach fnType to HIRFunction

--- 

(This came out of running a sync and observing hundreds of bailouts due from 
this validation) 

Reading `fnType` from environment overgeneralizes, as inner functions are 
usually not the type of the outer react function. 

``` 

// Component type 

function Component() { 

// not Component type 

const helper = () => {...}; 

} 

``` 

Let's attach fnType to `HIRFunction` and use that for our inference + 
validations