Reland "[lldb][DWARF] Remove object_pointer from ParsedDWARFAttributes (#145065)" (#145126) This reverts commit 877511920dcf36463e06746d626e8876583a6abd. This fixes the `TestObjCInBlockVars.py` LLDB API test. The issue was that `GetCXXObjectParameter` wouldn't deduce the object parameter of Objective-C method definitions correctly. In DWARF those don't have a `DW_AT_specification` (so no link back to a DeclContext that is a class type). The fix is to only check the validity of the DeclContext DIE *if* no `DW_AT_object_pointer` exists on the DIE. If `DW_AT_object_pointer` does exist, we should just always use that as the object_parameter.
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