Rollup merge of #89025 - ricobbe:raw-dylib-link-ordinal, r=michaelwoerister

Implement `#[link_ordinal(n)]`

Allows the use of `#[link_ordinal(n)]` with `#[link(kind = "raw-dylib")]`, allowing Rust to link against DLLs that export symbols by ordinal rather than by name.  As long as the ordinal matches, the name of the function in Rust is not required to match the name of the corresponding function in the exporting DLL.

Part of #58713.

compiler/rustc_metadata/src/native_libs.rs

@@ -433,6 +433,12 @@ impl Collector<'tcx> {
                 }
             }
         };
-        DllImport { name: item.ident.name, ordinal: None, calling_convention, span: item.span }
+
+        DllImport {
+            name: item.ident.name,
+            ordinal: self.tcx.codegen_fn_attrs(item.id.def_id).link_ordinal,
+            calling_convention,
+            span: item.span,
+        }
     }
 }