[commit: ghc] master: Update stm submodule to 2.4.4 release (0ac059d)

[git at git.haskell.org]

Repository : ssh://git@git.haskell.org/ghc

On branch  : master
Link       : http://ghc.haskell.org/trac/ghc/changeset/0ac059dcd53bb41fdeb2a20af74ecc046a519b8f/ghc

>---------------------------------------------------------------

commit 0ac059dcd53bb41fdeb2a20af74ecc046a519b8f
Author: Herbert Valerio Riedel <hvr at gnu.org>
Date:   Wed Dec 17 12:04:58 2014 +0100

    Update stm submodule to 2.4.4 release


>---------------------------------------------------------------

0ac059dcd53bb41fdeb2a20af74ecc046a519b8f
 libraries/stm | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libraries/stm b/libraries/stm
index eadf716..b5cb4c4 160000
--- a/libraries/stm
+++ b/libraries/stm
@@ -1 +1 @@
-Subproject commit eadf71656bb1a75e2355aee1bd07843c8bd3482a
+Subproject commit b5cb4c462e008c666631c14435df0dd90fb20517