resolver should use different mark for top level bindings and unresolved identifiers

[kdy1]

No description provided.

[dsherret]

I started working on #2996 and I think it would be better to fix that along with doing this change. Basically there needs to be a way to express:

import { Name } from "./something";

...as being a module level binding that's not accessible within the module. I should work on other things right now, but this is a source of some bugs.

[swc-bot]

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