[MacPorts] #49001: Add support to provide a clang-based as wrapper

[MacPorts]

#49001: Add support to provide a clang-based as wrapper
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  Reporter:  howarth.at.macports@…  |      Owner:  jeremyhu
      Type:  defect                 |     Status:  assigned
  Priority:  Normal                 |  Milestone:
 Component:  ports                  |    Version:  2.3.3
Resolution:                         |   Keywords:
      Port:  clang-3.7              |
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Comment (by jeremyhu):

 Ugg.  Hopefully not as that can cause a dependency cycle.  I’ll have to
 check what was done there.

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Ticket URL: <https://trac.macports.org/ticket/49001#comment:21>
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