[MacPorts] #48759: llvm-3.7: Update to release and add +openmp

[MacPorts]

#48759: llvm-3.7: Update to release and add +openmp
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  Reporter:  eborisch@…   |      Owner:  jeremyhu@…
      Type:  enhancement  |     Status:  new
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:  2.3.3
Resolution:               |   Keywords:
      Port:  clang-3.7    |
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Comment (by ryandesign@…):

 Don't use "extract.suffix .tar.xz"; it is implied by "use_xz yes".

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Ticket URL: <https://trac.macports.org/ticket/48759#comment:2>
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