Rollup merge of #110983 - GuillaumeGomez:foreign-repr, r=notriddle

rustdoc: Get `repr` information through `AdtDef` for foreign items

As suggested by `@notriddle,` this approach works too. The only downside is that the display of the original attribute isn't kept, but I think it's an acceptable downside.

r? `@notriddle`

src/librustdoc/lib.rs

@@ -34,6 +34,7 @@ extern crate tracing;
 // Dependencies listed in Cargo.toml do not need `extern crate`.
 
 extern crate pulldown_cmark;
+extern crate rustc_abi;
 extern crate rustc_ast;
 extern crate rustc_ast_pretty;
 extern crate rustc_attr;