LLVM 7.1.0: how to proceed?

[Brooks Davis]

LLVM 7.1.0 will be release shortly and contains a single
fix which breaks the LLVM Libra ABI in order to fix an
incompatibility with GCC 8.2.  A bug describing the issue is at
https://bugs.llvm.org/show_bug.cgi?id=39427.

My current plan is:
 - Copy devel/llvm70 to devel/llvm71 and update.
 - Perform a coordinated switch of all dependencies, to llvm71 (e.g. do an
   exp-run with the switch made and llvm70 removed).  All ports with
   library dependencies would get PORT_REVISION bumps.
 - DEPRECATE llvm70 and set a short expiration.

Does this sound like a reasonable plan?

-- Brooks
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