svn commit: r353947 - vendor/libc++/libc++-r375505

[Dimitry Andric]

Author: dim
Date: Wed Oct 23 17:52:35 2019
New Revision: 353947
URL: https://svnweb.freebsd.org/changeset/base/353947

Log:
  Tag stripped libc++ trunk r375505, the last commit before the upstream
  Subversion repository was made read-only, and the LLVM project migrated
  to GitHub.

Added:
  vendor/libc++/libc++-r375505/
     - copied from r353946, vendor/libc++/dist/