[MacPorts] #52551: ghc: bump llvm dep

[MacPorts]

#52551: ghc: bump llvm dep
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  Reporter:  lists@…  |      Owner:  cal@…
      Type:  defect   |     Status:  new
  Priority:  Normal   |  Milestone:
 Component:  ports    |    Version:  2.3.4
Resolution:           |   Keywords:  haspatch
      Port:  ghc      |
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Comment (by cal@…):

 I'm also attaching the patch I have locally for GHC 8.0.1; maybe it helps
 you to figure out what went wrong with your build.

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Ticket URL: <https://trac.macports.org/ticket/52551#comment:4>
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