dillon1000/react

Dont count throw as an exit node (React semantics)

React will retry or abort components that throw (depending on a few conditions), 
so from React's perspective a `throw` statement is not a normal exit node. Thus 
the Rules of Hooks really have a caveat: the set of hooks that are called _in an 
execution that returns successfully_ must be consistent. Examples such as the 
following are therefore allowed: 

```javascript 

function Component(props) { 

if (props.cond) { 

throw new Error(...); 

} 

useHook(); 

} 

``` 

By modeling `throw` as an exit node, we rejected cases such as this. This diff 
changes to not model throws as exit nodes. #1584  changes this to make it an 
option, since some cases will want to consider throw as an exit node.