De-burninate tree.

Author: graydon

src/Makefile

@@ -500,6 +500,7 @@ TEST_XFAILS_LLVM := $(TASK_XFAILS) \
                       lazy-init.rs \
                       lazychan.rs \
                       leak-box-as-tydesc.rs \
+                      lib-bitv.rs \
                       lib-deque.rs \
                       lib-int.rs \
                       lib-io.rs \