Properly display narrowed types when hovering in IDE#8324
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This PR corrects the type information displayed when hovering over variables in the IDE. Specifically, the
getTypeOfSymbolAtLocationfunction used by the language service now consistently returns the narrowed type of a variable unless the variable is the target of an assignment. The PR also removes the old (and shimmed)getNarrowedTypeOfReferencefunction and replaces all usages with calls to the newgetFlowTypeOfReferencefunction.