[MacPorts] #52551: ghc: bump llvm dep

[MacPorts]

#52551: ghc: bump llvm dep
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  Reporter:  grimreaper  |      Owner:  neverpanic
      Type:  defect      |     Status:  reopened
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.3.4
Resolution:              |   Keywords:  haspatch
      Port:  ghc         |
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Comment (by kencu):

 Our version of ghc is tied specifically to llvm-3.5 (given the previous
 discussions we had about this with the maintainer, and what I read in the
 Portfile and in the ghc docs).

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Ticket URL: <https://trac.macports.org/ticket/52551#comment:13>
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