[MacPorts] #59243: clang-9.0 dependency error in macOS 10.15

[MacPorts]

#59243: clang-9.0 dependency error in macOS 10.15
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 Reporter:  jerryzj  |      Owner:  <jeremyhu@…>
     Type:  defect   |     Status:  assigned
 Priority:  High     |  Milestone:  MacPorts 2.7.0
Component:  ports    |    Version:  2.6.1
 Keywords:  bug      |       Port:  clang-9.0
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 When I tried to install clang-9.0 after llvm-9.0 installed.

 The dependency list shows that it needs llvm-8.0,
 I think this might be a bug.

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Ticket URL: <https://trac.macports.org/ticket/59243>
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