[llvm] [CLANG][DWARF] Handle DIE offset collision in DW_IDX_parent (PR #95039)

[Alexander Yermolovich via llvm-commits]

ayermolo wrote:

Thanks for flagging.
Looks like issue is in: llvm/lib/DWARFLinker/Parallel/DWARFLinkerImpl.cpp

```
DebugNames->addName(
            *DebugStrStrings.getExistingEntry(Info.String), Info.OutOffset,
            std::nullopt /*ParentDIEOffset*/, Info.Tag, CU->getUniqueID(),
            CU->getOutUnitDIE()->getTag() == dwarf::DW_TAG_type_unit);
```
Passing false instead fixes asan.            

https://github.com/llvm/llvm-project/pull/95039