[MacPorts] #62330: clang-5.0 - clang-11: add emulated_tls functionality to compiler_rt

[MacPorts]

#62330: clang-5.0 - clang-11: add emulated_tls functionality to compiler_rt
-------------------------------------------------+-------------------------
  Reporter:  kencu                               |      Owner:  kencu
      Type:  defect                              |     Status:  assigned
  Priority:  Normal                              |  Milestone:
 Component:  ports                               |    Version:
Resolution:                                      |   Keywords:
      Port:  libcxx clang-5.0 clang-6.0          |
  clang-7.0 clang-8.0 clang-9.0 clang-10         |
  clang-11 clang-devel                           |
-------------------------------------------------+-------------------------

Comment (by kencu):

 this becomes relevant now because the lack of the emulated_tls symbols
 causes a build failure in a planned update to {{{mesa}}} 20.x.

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Ticket URL: <https://trac.macports.org/ticket/62330#comment:3>
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