[llvm] [DWARFYAML] Implement debug_names support (PR #79666)

[Felipe de Azevedo Piovezan via llvm-commits]

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@@ -118,6 +118,28 @@ struct Unit {
   std::vector<Entry> Entries;
 };
 
+struct IdxForm {
+  llvm::dwarf::Index Idx;
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felipepiovezan wrote:

> here and throughout this file,

I will remove the extra uses included by this PR, but changing the rest of the file is be beyond the scope of this PR and should be addressed in some NFC change, though we tend to avoid large cosmetic changes for git-blame reasons.

https://github.com/llvm/llvm-project/pull/79666