dillon1000/react

Improve NoSetStateInRender function expression check

Updates the approach used in ValidateNoSetStateInRender to detect function 
expressions called during render. We now do the following: 

* Track function expression which are known to unconditionally call setState 
themselves- if these functions get called, that’s equivalent to calling 
setState. We call the validation recursively to compute this. 

* Track LoadLocal/StoreLocal indirections for such function expressions. 

* Check CallExpressions where the callee is either a known SetState (via type 
info) _or_ (new) where the callee is in the set of known-to-setState function 
expressions. 

The Set is shared throughout the analysis, so we can even find multiple levels 
of indirection (see new test case).