update libcds

diff --git a/modules/data-structures b/modules/data-structures
index 73ae130e59cd5100b7c6035df2b3b5b28da4e875..3b84e2fac325043e212c74e83c4f03a448163c07 160000 (submodule)
--- a/modules/data-structures
+++ b/modules/data-structures
@@ -1 +1 @@
-Subproject commit 73ae130e59cd5100b7c6035df2b3b5b28da4e875
+Subproject commit 3b84e2fac325043e212c74e83c4f03a448163c07