[MacPorts] #61538: llvm-9.0 @9.0.1 seems to install faulty symbolic links

[MacPorts]

#61538: llvm-9.0 @9.0.1 seems to install faulty symbolic links
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  Reporter:  ballapete  |      Owner:  (none)
      Type:  defect     |     Status:  closed
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:  2.6.4
Resolution:  invalid    |   Keywords:
      Port:  clang-3.8  |
------------------------+--------------------

Comment (by ballapete):

 And what about the fact that they were not removed when I had to uninstall
 everything in order to upgrade from Catalina to Big Sur? From their date
 you can see that they are "old" – I installed Big Sur on Sunday.

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Ticket URL: <https://trac.macports.org/ticket/61538#comment:6>
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