Moved all of the tests over to ui and annotated why they are failing with appropriate fixme comments

src/test/compile-fail/feature-gate-generic_associated_types.rs

@@ -12,13 +12,17 @@ use std::ops::Deref;
 
 trait PointerFamily<U> {
     type Pointer<T>: Deref<Target = T>;
+    //~^ ERROR generic associated types are unstable
     type Pointer2<T>: Deref<Target = T> where T: Clone, U: Clone;
+    //~^ ERROR generic associated types are unstable
 }
 
 struct Foo;
 impl PointerFamily<u32> for Foo {
     type Pointer<usize> = Box<usize>;
+    //~^ ERROR generic associated types are unstable
     type Pointer2<u32> = Box<u32>;
+    //~^ ERROR generic associated types are unstable
 }
 
 fn main() {}