Move two fn assignability tests from compile-fail to run-pass

src/test/run-pass/fn-assign-managed-to-bare-1.rs

@@ -5,6 +5,6 @@ fn add(n: int) -> fn@(int) -> int {
 fn main()
 {
       assert add(3)(4) == 7;
-      let add3 : fn(int)->int = add(3); //~ ERROR mismatched types
+      let add3 : fn(int)->int = add(3);
       assert add3(4) == 7;
 }

src/test/run-pass/fn-assign-managed-to-bare-2.rs

@@ -12,6 +12,6 @@ fn main()
     let add2 : &(fn@(int)->int) = &add(2);
     assert (*add2)(5) == 7;
 
-    let add3 : fn(int)->int = add(3); //~ ERROR mismatched types
+    let add3 : fn(int)->int = add(3);
     assert add3(4) == 7;
 }