[GHC] #11566: I don't need madvise DONT_NEED

[GHC]

#11566: I don't need madvise DONT_NEED
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        Reporter:  mfox              |                Owner:
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.1
      Resolution:                    |             Keywords:
Operating System:  Linux             |         Architecture:  aarch64
 Type of failure:  Incorrect         |            Test Case:
  warning at compile-time            |
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by mfox):

 I can make a patch easily deleting the call seems fine. I just wonder if
 it affects another platform. Should I ifdef it out for Linux? For aarch64?
 For Linux && aarch64? Who uses this?

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11566#comment:1>
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