[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:  assigned
  Priority:  Normal              |  Milestone:
 Component:  ports               |    Version:
Resolution:                      |   Keywords:
      Port:  clang-9.0 clang-10  |
---------------------------------+----------------------

Comment (by kencu):

 Replying to [comment:27 tiperiu]:

 > Not sure what I need to do to get the newer one

 taking some time rolling out I guess. You could do this if you're in a big
 hurry:
 {{{
 cd /Users/Shared
 git clone https://github.com/macports/macports-ports.git
 cd lang/llvm-devel
 sudo port -v install subport=llvm-devel
 sudo port -v install subport=clang-devel
 cd ~
 }}}

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Ticket URL: <https://trac.macports.org/ticket/61477#comment:28>
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