[Bug 233664] enable LLVM libunwind for armv7, armv6

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

--- Comment #15 from commit-hook at freebsd.org ---
A commit references this bug:

Author: mmel
Date: Mon Dec 16 14:08:50 UTC 2019
New revision: 355803
URL: https://svnweb.freebsd.org/changeset/base/355803

Log:
  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:
  head/contrib/libunwind/src/UnwindLevel1-gcc-ext.c
  head/lib/libgcc_s/Makefile
  head/lib/libgcc_s/Symbol.map
  head/lib/libgcc_s/SymbolDefault.map
  head/lib/libgcc_s/arm/Symbol.map

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