Fix jump to def link generation on primitive type associated methods

[GuillaumeGomez]

Fixes #156707.

Interestingly enough, the inference fails on primitive type, so instead I go around a bit by generating a PrimitiveType and then tweak a bit the href generation.

r? @fmease

[rust-log-analyzer]

The job tidy failed! Check out the build log: (web) (plain enhanced) (plain)

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fmt check
Diff in /checkout/src/librustdoc/html/format.rs:459:
     }
 
     let (fqp, shortty): (Vec<Symbol>, ItemType) = match prim {
-        Some(prim) => {
-            (vec![crate_name, prim.as_sym()], ItemType::Primitive)
-        }
+        Some(prim) => (vec![crate_name, prim.as_sym()], ItemType::Primitive),
         None => {
             let relative = clean::inline::item_relative_path(tcx, def_id);
             (once(crate_name).chain(relative).collect(), ItemType::from_def_id(def_id, tcx))
fmt: checked 6864 files
Bootstrap failed while executing `test src/tools/tidy tidyselftest --extra-checks=py,cpp,js,spellcheck`
Build completed unsuccessfully in 0:00:49
  local time: Tue May 19 02:09:27 UTC 2026
  network time: Tue, 19 May 2026 02:09:27 GMT