19a71f6 Merging r360861, with an additional change to also add the PPC64_OPD1

Authored and Committed by Dimitry Andric 4 years ago
    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
    
        
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