[commit: ghc] ghc-8.6: Bump stm submodule (beca642)

[git at git.haskell.org]

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

On branch  : ghc-8.6
Link       : http://ghc.haskell.org/trac/ghc/changeset/beca6421efb0e9c0c3d34e535a83191256b83320/ghc

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

commit beca6421efb0e9c0c3d34e535a83191256b83320
Author: Ben Gamari <ben at smart-cactus.org>
Date:   Mon Aug 20 15:04:31 2018 -0400

    Bump stm submodule


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beca6421efb0e9c0c3d34e535a83191256b83320
 libraries/stm | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libraries/stm b/libraries/stm
index 637013d..4a1deb9 160000
--- a/libraries/stm
+++ b/libraries/stm
@@ -1 +1 @@
-Subproject commit 637013d3f2596c86adc8c946e2f38e9e1a85fd84
+Subproject commit 4a1deb98fc95e55d8a6762a7dfec1a7dfa8b49b2