dillon1000/react

Generalize #1521 for PropertyLoad

This is a more general version of the change from #1521. That PR ensured that 
LoadLocal temporaries accessed outside the instruction's scope are correctly 
promoted. However, we have a similar pattern with PropertyLoad. 

This PR adds a general mechanism for handling these type of indirections: any 
LoadLocal/PropertyLoad temporary accessed when it's defining scope is not active 
will be promoted to a declaration of the defining scope. Notably, we do this in 
a way that ensures that the dependencies are preserved, ie that we correctly 
view the operand of LoadLocal/PropertyLoad as a dependency of the current scope.