Remove the bind-alias test, since binding to aliases is fine.

src/test/compile-fail/bind-alias.rs

@@ -1,9 +0,0 @@
-// xfail-stage0
-// xfail-stage1
-// xfail-stage2
-// xfail-stage3
-// error-pattern: binding alias slot
-
-fn f(x: &int) { }
-
-fn main() { bind f(10); }