[llvm] [NFC][DebugInfo] Wrap DILineInfo return type with std::optional to handle missing debug info. (PR #129792)

[David Blaikie via llvm-commits]

================
@@ -565,9 +565,11 @@ static bool lookup(ObjectFile &Obj, DWARFContext &DICtx, uint64_t Address,
 
   // TODO: it is neccessary to set proper SectionIndex here.
   // object::SectionedAddress::UndefSection works for only absolute addresses.
-  if (DILineInfo LineInfo = DICtx.getLineInfoForAddress(
+  DILineInfo LineInfo;
+  if (std::optional<DILineInfo> DBGLineInfo = DICtx.getLineInfoForAddress(
           {Lookup, object::SectionedAddress::UndefSection}))
-    LineInfo.dump(OS);
+    LineInfo = *DBGLineInfo;
+  LineInfo.dump(OS);
----------------
dwblaikie wrote:

Does this change behavior? The previous code dumped conditionally, this code dumps unconditionally?

https://github.com/llvm/llvm-project/pull/129792