[GHC] #12469: Memory fence on writes to MutVar/Array missing on ARM

[GHC]

#12469: Memory fence on writes to MutVar/Array missing on ARM
-------------------------------------+-------------------------------------
        Reporter:  rrnewton          |                Owner:  trommler
            Type:  bug               |               Status:  patch
        Priority:  normal            |            Milestone:  8.0.2
       Component:  Compiler          |              Version:  8.0.1
      Resolution:                    |             Keywords:  memory model
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Incorrect result  |  Unknown/Multiple
  at runtime                         |            Test Case:
      Blocked By:                    |             Blocking:  12537
 Related Tickets:                    |  Differential Rev(s):  Phab:D2495
       Wiki Page:                    |  Phab:D2525
-------------------------------------+-------------------------------------
Changes (by trommler):

 * status:  new => patch
 * differential:  Phab:D2495 => Phab:D2495 Phab:D2525


Comment:

 With Phab:D2525 I have not seen the panic in `mkFastStringWith` described
 in #12537 anymore. I rebuilt Stackage nightly twice on a powerpce64le.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12469#comment:16>
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