rustc: Fix type_need_unwind_cleanup. Closes #2272

src/test/compile-fail/class-implements-int.rs

@@ -1,10 +1,3 @@
-// xfail-test
-/*
-  tjc: currently this results in a memory leak after a call to
-  span_fatal in typeck. I think it's the same issue as #2272, because
-  if I make type_needs_unwind_cleanup always return true, the test passes.
-  FIXME: Un-xfail this when #2272 is fixed.
- */
 class cat implements int { //! ERROR can only implement interface types
   let meows: uint;
   new(in_x : uint) { self.meows = in_x; }

src/test/compile-fail/infinite-instantiation.rs

@@ -1,7 +1,5 @@
 // error-pattern: overly deep expansion
 // issue 2258
-// This is currently exposing a memory leak, and xfailed for that reason
-// xfail-test
 
 iface to_opt {
     fn to_option() -> option<self>;