[GHC] #11578: Fix GHC on AArch64/Arm64

[GHC]

#11578: Fix GHC on AArch64/Arm64
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        Reporter:  erikd             |                Owner:
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:  8.2.1
       Component:  Compiler          |              Version:  8.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:  aarch64
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by rwbarton):

 Why would an unregisterised ''bindist'' use LLVM even if it detects an
 appropriate version though? That is surely a bug if it happens. The
 libraries in the bindist are all built with the unregisterised calling
 convention.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11578#comment:10>
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