xfail-fast the #[main] tests, r=burningtree

src/test/run-pass/attr-main-2.rs

@@ -8,6 +8,8 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
+// xfail-fast
+
 fn main() {
     fail
 }

src/test/run-pass/attr-main.rs

@@ -8,6 +8,8 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
+// xfail-fast
+
 #[main]
 fn foo() {
 }