[Bug 233664] enable LLVM libunwind for armv7, armv6

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=233664

--- Comment #22 from commit-hook at FreeBSD.org ---
A commit references this bug:

Author: dim
Date: Thu Aug  6 19:08:29 UTC 2020
New revision: 363976
URL: https://svnweb.freebsd.org/changeset/base/363976

Log:
  Reapply r355803 (by mmel):

  Fix LLVM libunwnwind _Unwind_Backtrace symbol version for ARM.
  In original  GNU libgcc, _Unwind_Backtrace is published with GCC_3.3 version
  for all architectures but ARM. For ARM should be publishes with GCC_4.3.0
  version. This was originally omitted in r255095, fixed in r318024 and omitted
  aging in LLVM libunwind implementation in r354347.

  For ARM _Unwind_Backtrace should be published as default with GCC_4.3.0
  version , (because this is right original version) and again as
  normal(not-default) with GCC_3.3 version (to maintain ABI compatibility
  compiled/linked with wrong pre r318024 libgcc)

  PR:   233664

Changes:
 
projects/clang1100-import/contrib/llvm-project/libunwind/src/UnwindLevel1-gcc-ext.c

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