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

[GHC]

#11578: Fix GHC on AArch64/Arm64
-------------------------------------+-------------------------------
        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 erikd):

 GHC 7.10 does *not* work here with llvm-3.7. What I get is:

 {{{
 You are using a new version of LLVM that hasn't been tested yet!
 We will try though...
 /usr/bin/opt-3.7: /tmp/ghc16717_0/ghc_26.ll:7:6: error: unexpected type in
 metadata definition
 !0 = metadata !{metadata !"top", i8* null}
 }}}

 which in hindsight is what I expected.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11578#comment:1>
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