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Jon Ross-Perkins
92fa0ac1ac
This was to track use of a declaration after import, prior to a redeclaration. Per [discussion on Discord](https://discord.com/channels/655572317891461132/1217182321933815820/1236016521059237962), we likely don't need this check due to the change in behavior of `extern`. Rather than potentially getting one of many `extern` decls and depending on it by accident, it is now planned to be _required_ to be imported, and the library doing a non-`extern` decl must _know_ it's importing the `extern` decl. The stricter requirement on the library means it now seems more reasonable to use the `extern` decl. So kind of rolling back #3831, though keeping `ImportIRInstId` (at least for now) and keeping `Loaded`/`Unloaded` terminology (seems a nicer fit).