[GHC] #15430: Merge llvm fix to ghc-8.6

[GHC]

#15430: Merge llvm fix to ghc-8.6
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           Reporter:  monoidal       |             Owner:  (none)
               Type:  bug            |            Status:  new
           Priority:  highest        |         Milestone:  8.6.1
          Component:  Compiler       |           Version:  8.5
           Keywords:                 |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  None/Unknown
  Unknown/Multiple                   |
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
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 This ticket is a reminder to make sure that
 https://phabricator.haskell.org/D4969 (Fix a major copy'n'paste error in
 LLVM CodeGen) is merged to ghc-8.6.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15430>
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