[Bug 233664] enable LLVM libunwind for armv7, armv6

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

Conrad Meyer <cem at freebsd.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|New                         |Closed
            Summary|enable LLVM libunwind for   |enable LLVM libunwind for
                   |armv7, armv6, arm           |armv7, armv6
         Resolution|---                         |FIXED

--- Comment #4 from Conrad Meyer <cem at freebsd.org> ---
Ah, sorry for duplicating work.  I wasn't aware of this PR.

Yeah, there were a couple problems here.  The unwind-ehabi-helpers.h file just
produced conflicts with existing definitions.  There are at least two different
variants of unwind.h in our tree, and different portions gcc_personality_v0
build with different headers.

Like comment 2 suggests, I added the extra GCC 3.5 symbols to ARM only using
Symbol.map.  And as the description suggests, we needed those 3 other symbols
as well.  No one has complained yet, afaik, but I haven't checked my email yet
this morning.

I think we can drop 'arm' from the Summary and resolve this, given it's on the
chopping block for 2020.

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