[MacPorts] #58713: ispc: Use newer llvm

[MacPorts]

#58713: ispc: Use newer llvm
------------------------+----------------------
 Reporter:  ryandesign  |      Owner:  tenomoto
     Type:  defect      |     Status:  assigned
 Priority:  Normal      |  Milestone:
Component:  ports       |    Version:
 Keywords:              |       Port:  ispc
------------------------+----------------------
 ispc fails to install, because it depends upon llvm-3.9, which was removed
 from MacPorts:

 {{{
 $ sudo port install ispc
 --->  Computing dependencies for ispc
 --->  Dependencies to be installed: clang-3.9
 --->  Fetching distfiles for clang-3.9
 --->  Verifying checksums for clang-3.9
 --->  Extracting clang-3.9
 --->  Configuring clang-3.9
 Error: clang-3.9 has been replaced by clang-8.0; please install that
 instead.
 }}}

 Please switch to a newer version of llvm. A [ticket:58637 new version of
 ispc] is available, in case that provides compatibility with a newer llvm
 version.

-- 
Ticket URL: <https://trac.macports.org/ticket/58713>
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