rustc: Fix shadowing private import with reexport

The reexport didn't switch the privacy, so the reexport was actually considered
private, erroneously failing to resolve imports later on.

Closes #14082

src/test/run-pass/issue-14082.rs

@@ -0,0 +1,29 @@
+// Copyright 2014 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+#![feature(globs)]
+#![allow(unused_imports, dead_code)]
+
+use foo::GC;
+
+mod foo {
+    use d::*;
+    pub use m::GC; // this should shadow d::GC
+}
+
+mod m {
+    pub struct GC;
+}
+
+mod d {
+    pub struct GC;
+}
+
+fn main() {}