[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 eborisch@…):

 Any other concerns, or can I go ahead and patch? Other than the version
 bump, the only change when compiled without (+openmp) is making sure
 +/-assertions variant matches for clang/llvm. With +openmp, this also
 patches the toolchain and passes and adds a configure argument to find
 MacPorts' libomp such that '-fopenmp' works, as mentioned above.

 It is more of a change than what was originally discussed on the mailing
 list, so I was waiting for feedback...

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Ticket URL: <https://trac.macports.org/ticket/48759#comment:3>
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