[MacPorts] #56215: clang-6.0 @6.0-r321774: update to 6.0.0

[MacPorts]

#56215: clang-6.0 @6.0-r321774: update to 6.0.0
----------------------+--------------------------------
 Reporter:  mopihopi  |      Owner:  (none)
     Type:  update    |     Status:  new
 Priority:  Normal    |  Milestone:
Component:  ports     |    Version:
 Keywords:            |       Port:  clang-6.0 llvm-6.0
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 Please update the clang-6.0 and llvm-6.0 ports to the official released
 version 6.0.0.

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Ticket URL: <https://trac.macports.org/ticket/56215>
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