Merging r360861, with an additional change to also add the PPC64_OPD1

and PPC64_OPD2 lines to the DEFINE_LIBUNWIND_PRIVATE_FUNCTION() macro,
which was removed in r357640:

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r360861 | mstorsjo | 2019-05-15 23:49:13 -0700 (Wed, 15 May 2019) | 13 lines

[PPC64][libunwind] Fix r2 not properly restored

This change makes each unwind step inspect the instruction at the
return address and, if needed, read r2 from its saved location and
modify the context appropriately.

The unwind logic is able to handle both ELFv1 and ELFv2 stacks.

Reported by Bug 41050

Patch by Leandro Lupori!

Differential Revision: https://reviews.llvm.org/D59694
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llvm-svn: 365542