[MacPorts] #52491: ghc requires llvm-3.5, which is unsupported on macOS 10.12

[MacPorts]

#52491: ghc requires llvm-3.5, which is unsupported on macOS 10.12
----------------------+-------------------
 Reporter:  jowens@…  |      Owner:  cal@…
     Type:  defect    |     Status:  new
 Priority:  Normal    |  Milestone:
Component:  ports     |    Version:  2.3.4
 Keywords:            |       Port:
----------------------+-------------------
 ```
 $ sudo port upgrade ghc
 --->  Computing dependencies for llvm-3.5
 --->  Fetching distfiles for llvm-3.5
 Error: llvm-3.5 is not supported on macOS Sierra or newer.
 ```

 cc: llvm-3.5 owners. Not sure if this is a ghc issue or an llvm-3.5 issue.

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Ticket URL: <https://trac.macports.org/ticket/52491>
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