Auto merge of #41733 - nikomatsakis:incr-comp-remove-ast-ty-to-ty-cache, r=eddyb

Remove ast-ty-to-ty cache

As discussed on IRC, this basically just removes the cache, and rewrites rustdoc and save-analysis so call into the astconv code. It *might* make sense for this to be a more fine-grained query, but that would (at least) require us to be using `HirId` and not `NodeId`.

(Perhaps I should open a FIXME?)

I didn't measure perf impact (yet?). I did observe that the cache seems to hit *rarely* -- and only in between items (I experimented with a cache "per def-id", but that had zero hits). In other words, every single hit on the cache is a dependency bug, since it is "shuttling" information between items without dependency edges.

r? @eddyb

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