Implement resolver warnings about reexporting private dependencies

compiler/rustc_lint/src/lints.rs

@@ -3080,6 +3080,14 @@ pub(crate) struct HiddenGlobReexports {
     pub namespace: String,
 }
 
+#[derive(LintDiagnostic)]
+#[diag(lint_reexport_private_dependency)]
+pub(crate) struct ReexportPrivateDependency {
+    pub name: String,
+    pub kind: String,
+    pub krate: Symbol,
+}
+
 #[derive(LintDiagnostic)]
 #[diag(lint_unnecessary_qualification)]
 pub(crate) struct UnusedQualifications {