ZequanWu wrote:

> In which case, GetDIEToType().lookup(decl_die) will return a nullptr. This is 
> already a bit iffy because some of the surrounding code assumes we don't call 
> CompleteTypeFromDWARF with a nullptr Type*. E.g., CompleteEnumType blindly 
> dereferences it (though enums will never encounter this because their 
> definition is fetched in ParseEnum, unlike for structures).

Should we bail out early if the Type* is null and return false to tell 
`SymbolFileDWARFDebugMap::CompleteType` that it can not complete this type and 
let it iterate to the symbol file that has the entry in its map.

https://github.com/llvm/llvm-project/pull/120569
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