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2021-12-22T10:11:34.490113Z
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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
(cherry picked from commit e8141ad1df2098dd3f6d627c49ce99307315f5fd)

Git Hash:   33b6e67445548c4a5e81fe6d626dbb29c9246042
Git Author: dim@FreeBSD.org
END