[MacPorts] #57825: Upgrade: GHC from 7.8.3 to at least 8.4.3

[MacPorts]

#57825: Upgrade: GHC from 7.8.3 to at least 8.4.3
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  Reporter:  mouse07410  |      Owner:  neverpanic
      Type:  update      |     Status:  closed
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:
Resolution:  duplicate   |   Keywords:
      Port:  ghc         |
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Comment (by kencu):

 This ticket is closed, but FYI, each version of Haskell is more or less
 bound to a specific version of llvm, so it's not possible to arbitrarily
 try to upgrade it to a new llvm.

 see
 <https://ghc.haskell.org/trac/ghc/wiki/Commentary/Compiler/Backends/LLVM/Installing>

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Ticket URL: <https://trac.macports.org/ticket/57825#comment:4>
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