Move some tests to more reasonable directories

src/test/ui/issues/auxiliary/issue-10031-aux.rs

@@ -1 +0,0 @@
-pub struct Wrap<A>(pub A);

src/test/ui/issues/issue-10031.rs

@@ -1,9 +0,0 @@
-// run-pass
-// aux-build:issue-10031-aux.rs
-// pretty-expanded FIXME #23616
-
-extern crate issue_10031_aux;
-
-pub fn main() {
-    let _ = issue_10031_aux::Wrap(());
-}