[MacPorts] #69805: macports-libcxx: sync with the latest compatible version of LLVM

[MacPorts]

#69805: macports-libcxx: sync with the latest compatible version of LLVM
--------------------------------------------+-----------------------------
 Reporter:  aeiouaeiouaeiouaeiouaeiouaeiou  |      Owner:  (none)
     Type:  defect                          |     Status:  new
 Priority:  Normal                          |  Milestone:
Component:  ports                           |    Version:
 Keywords:                                  |       Port:  macports-libcxx
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 [changeset:c1c4b4cbb91b9c83969f52e2a5ad424e4716cd80/macports-ports Bitcoin
 27.0] now uses the {{{std::bit_width}}} function, which was only properly
 [https://github.com/llvm/llvm-
 project/commit/1a036e9cc82a7f6d6f4675d631fa5eecd8748784 implemented in
 LLVM 12].

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Ticket URL: <https://trac.macports.org/ticket/69805>
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