dillon1000/react

[hir] Remove unused code from InferAlias

For now, we've decided to punt on super fine grained aliasing of fields (ie, 
mutating x.y shouldn't mutate x.z or it's aliases). 

This PR removes the code that tracks the aliases of each field. We can re-add 
this when we revisit this functionality. 

For the rest of the field aliasing, most of it has been replaced by 
InferAliasForStores.