[commit: ghc] master: Update submodule (3ee7ca1)

[git at git.haskell.org]

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

On branch  : master
Link       : http://ghc.haskell.org/trac/ghc/changeset/3ee7ca1b07eb78d037be9c654db345d641657b4f/ghc

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

commit 3ee7ca1b07eb78d037be9c654db345d641657b4f
Author: Simon Marlow <marlowsd at gmail.com>
Date:   Fri Jul 13 10:29:02 2018 +0100

    Update submodule


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3ee7ca1b07eb78d037be9c654db345d641657b4f
 libraries/stm | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libraries/stm b/libraries/stm
index 637013d..4c24db6 160000
--- a/libraries/stm
+++ b/libraries/stm
@@ -1 +1 @@
-Subproject commit 637013d3f2596c86adc8c946e2f38e9e1a85fd84
+Subproject commit 4c24db6071fc1319232934562f7dbed45d498831