[Bug 233405] sparc64: DWARF unwinder required for GCC 4.2.1 retirement

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=233405

--- Comment #14 from commit-hook at freebsd.org ---
A commit references this bug:

Author: emaste
Date: Wed Jan  8 20:37:04 UTC 2020
New revision: 356513
URL: https://svnweb.freebsd.org/changeset/base/356513

Log:
  libunwind: untested attempt to fix sparc64 build

  sparc64 is the only architecture currently using the DWARF unwinder from
  GCC 4.2.1.  Old GCC and related libraries are being removed soon; absent
  other changes sparc64 would be left with no unwinder when that happens.

  Instead, commit these changes which should at least allow the LLVM
  unwinder to build.  Someone with access to the obolete sparc64 hardware
  supported by FreeBSD will need to test the result.

  PR:           233405
  Submitted by: cem

Changes:
  head/contrib/llvm-project/libunwind/include/__libunwind_config.h
  head/contrib/llvm-project/libunwind/src/config.h

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