test: Un-XFAIL regions-mock-trans.rs and regions-mock-trans-impls.rs

Author: pcwalton

src/test/run-pass/regions-mock-trans-impls.rs

@@ -1,5 +1,3 @@
-// xfail-test
-
 import libc, sys, unsafe;
 
 enum arena = ();

src/test/run-pass/regions-mock-trans.rs

@@ -1,5 +1,3 @@
-// xfail-test
-
 import libc, sys, unsafe;
 
 enum arena = ();