Update TypeckResuts::closure_kind_origin to use Place

[arora-aman]

closure_kind_origin uses a (Span, Symbol) to store which Variable and which span resulted in us selected a particular closure kind(Fn, FnMut, FnOnce).

We want to update this to now use (Span, Place) to point to precise access. This would require us to modify the definition in rustc_middle/src/ty/context.rs, adjust_closure-kind, and uses of this map.