rustc_metadata: Remove `Span` from `ModChild`

It can be decoded on demand from regular `def_span` tables.

Partially mitigates perf regressions from #109500.

2 files changed, 8 insertions, 8 deletions

diff --git a/compiler/rustc_resolve/src/build_reduced_graph.rs b/compiler/rustc_resolve/src/build_reduced_graph.rs
index ff0f1f55975..f905cec1011 100644
--- a/compiler/rustc_resolve/src/build_reduced_graph.rs
+++ b/compiler/rustc_resolve/src/build_reduced_graph.rs
@@ -931,7 +931,13 @@ impl<'a, 'b, 'tcx> BuildReducedGraphVisitor<'a, 'b, 'tcx> {
     /// Builds the reduced graph for a single item in an external crate.
     fn build_reduced_graph_for_external_crate_res(&mut self, child: ModChild) {
         let parent = self.parent_scope.module;
-        let ModChild { ident, res, vis, span, .. } = child;
+        let ModChild { ident, res, vis, reexport_chain } = child;
+        let span = self.r.def_span(
+            reexport_chain
+                .first()
+                .and_then(|reexport| reexport.id())
+                .unwrap_or_else(|| res.def_id()),
+        );
         let res = res.expect_non_local();
         let expansion = self.parent_scope.expansion;
         // Record primary definitions.
diff --git a/compiler/rustc_resolve/src/imports.rs b/compiler/rustc_resolve/src/imports.rs
index 3c22d51c3d4..d7c518fbdd0 100644
--- a/compiler/rustc_resolve/src/imports.rs
+++ b/compiler/rustc_resolve/src/imports.rs
@@ -1276,13 +1276,7 @@ impl<'a, 'tcx> Resolver<'a, 'tcx> {
                         next_binding = binding;
                     }
 
-                    reexports.push(ModChild {
-                        ident,
-                        res,
-                        vis: binding.vis,
-                        span: binding.span,
-                        reexport_chain,
-                    });
+                    reexports.push(ModChild { ident, res, vis: binding.vis, reexport_chain });
                 }
             });