tromey wrote:

`DW_AT_specification` has a fairly specific meaning in DWARF.  I don't really 
understand why you want to link from the class type to the vtable (the reverse 
seems more useful to me), but I would suggest a new attribute, considering it 
is a new capability.  The link from the class to the specific vtable even seems 
mildly incorrect, in that during object construction the vtable will go through 
several different values, not just one.

Also linking from the vtable object to a member of the class seems less useful 
than the `DW_AT_containing_type` approach, where the link is explicitly to the 
type and not some member.

https://github.com/llvm/llvm-project/pull/130255
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