[MacPorts] #58920: llvm-7.0: update to 7.1.0

[MacPorts]

#58920: llvm-7.0: update to 7.1.0
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  Reporter:  jmroot    |      Owner:  jeremyhu
      Type:  update    |     Status:  assigned
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:
Resolution:            |   Keywords:
      Port:  llvm-7.0  |
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Comment (by kencu):

 <https://github.com/macports/macports-ports/pull/6148> for assessment.

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Ticket URL: <https://trac.macports.org/ticket/58920#comment:2>
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