[MacPorts] #57130: clang-7.0: build fails in compiler-rt/lib/xray on darwin < 15 due to several issues

[MacPorts]

#57130: clang-7.0: build fails in compiler-rt/lib/xray on darwin < 15 due to
several issues
------------------------+----------------------
  Reporter:  kencu      |      Owner:  jeremyhu
      Type:  defect     |     Status:  assigned
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:
Resolution:             |   Keywords:
      Port:  clang-7.0  |
------------------------+----------------------

Comment (by kencu):

 if XRAY is disabled, `clang-7.0` builds through on 10.9 without further
 modifications (and without the map_anonymous patch):
 {{{
 $ port -v installed clang-7.0
 The following ports are currently installed:
   clang-7.0 @7.0.0rc2_0+analyzer+libstdcxx (active) platform='darwin 13'
 archs='x86_64' date='2018-09-13T23:47:36-0700'
 }}}

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Ticket URL: <https://trac.macports.org/ticket/57130#comment:3>
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