[GHC] #15669: T7040_ghci has a suspicious testcase failure

[GHC]

#15669: T7040_ghci has a suspicious testcase failure
----------------------------------------+---------------------------------
           Reporter:  Phyx-             |             Owner:  (none)
               Type:  bug               |            Status:  new
           Priority:  normal            |         Milestone:  8.6.1
          Component:  Compiler          |           Version:  8.4.3
           Keywords:                    |  Operating System:  Windows
       Architecture:  Unknown/Multiple  |   Type of failure:  None/Unknown
          Test Case:  T7040_ghci        |        Blocked By:
           Blocking:                    |   Related Tickets:
Differential Rev(s):                    |         Wiki Page:
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 T7040_ghci has a weird failure. This looks like BSS initialization issue
 in the linker maybe?

 {{{
 +++ rts/T7040_ghci.run/T7040_ghci.run.stdout.normalised 2018-09-23
 17:26:01.197146900 +0100
 @@ -1,2 +1,2 @@
 -x: 0
 +x: 493156
  x: 1
 }}}

 Luckily the value seems to mutate correctly. So it may just be a simple
 missing `memset`.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15669>
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