Add regression test for non local items link generation

tests/rustdoc/jump-to-non-local-method.rs

@@ -0,0 +1,15 @@
+// compile-flags: -Zunstable-options --generate-link-to-definition
+
+#![crate_name = "foo"]
+
+use std::sync::atomic::AtomicIsize;
+
+// @has 'src/foo/jump-to-non-local-method.rs.html'
+// @has - '//a[@href="https://doc.rust-lang.org/nightly/core/sync/atomic/struct.AtomicIsize.html#method.new"]' 'AtomicIsize::new'
+
+pub fn bar() {
+    let _ = AtomicIsize::new(0);
+    b();
+}
+
+fn b() {}