[MacPorts] #61477: clang-9.0 fails to build on Big Sur macOS 11.0.1 Xcode 12.2

[MacPorts]

#61477: clang-9.0 fails to build on Big Sur macOS 11.0.1 Xcode 12.2
---------------------------------+--------------------
  Reporter:  jhoyt4              |      Owner:  kencu
      Type:  defect              |     Status:  closed
  Priority:  Normal              |  Milestone:
 Component:  ports               |    Version:
Resolution:  fixed               |   Keywords:
      Port:  clang-9.0 clang-10  |
---------------------------------+--------------------

Comment (by jhoyt4):

 I literally just did a "port selfupdate", "port clean --dist llvm-9.0
 clang-9.0" and attempted to install.  The ports tree seems to be slow in
 updating from git.

 I will try again later when the ports tree finally propogates the update

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Ticket URL: <https://trac.macports.org/ticket/61477#comment:36>
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