Rollup merge of #57846 - QuietMisdreavus:proc-macro-links, r=GuillaumeGomez

rustdoc: fix ICE from loading proc-macro stubs

Fixes https://github.com/rust-lang/rust/issues/55399

When trying to resolve a macro, rustdoc first tries to load it from the resolver to see whether it's a Macros 2.0 macro, so it can return that Def before looking for any other kind of macro. However, this becomes a problem when you try to load proc-macros: since you can't use a proc-macro inside its own crate, this lookup also fails when attempting to link to it.

However, we have a hint that this lookup will fail: Macros which are actually `ProcMacroStub`s will fail the lookup, so we can use that information to skip loading the macro. Rustdoc will then happily check `resolve.all_macros`, which will return a usable Def that we can link to.

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