Add xfail-stage0 to some tests (not sure if it matters...)

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

@@ -1,3 +1,4 @@
+// xfail-stage0
 // xfail-stage1
 // error-pattern:assigning to immutable alias
 

src/test/compile-fail/break-outside-loop.rs

@@ -1,3 +1,4 @@
+// xfail-stage0
 // error-pattern:Break outside a loop
 fn main() {
   auto pth = break;

src/test/compile-fail/type-recursive.rs

@@ -1,3 +1,4 @@
+// xfail-stage0
 // error-pattern:illegal recursive type
 type t1 = rec(int foo, t1 foolish);
 

src/test/run-fail/rhs-type.rs

@@ -1,5 +1,6 @@
 // Tests that trans treats the rhs of pth's decl
 // as a _|_-typed thing, not a str-typed thing
+// xfail-stage0
 // error-pattern:bye
 fn main() {
   auto pth = fail "bye";

src/test/run-pass/fn-expr.rs

@@ -1,3 +1,4 @@
+// xfail-stage0
 fn main() {
     auto x = fn(int a) -> int { ret a + 1; };
     assert (x(4) == 5);