[llvm] [BPF] Support wrapping BPF map structs into nested, single field structs (PR #144097)

[Tamir Duberstein via llvm-commits]

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@@ -976,11 +976,21 @@ void BTFDebug::visitMapDefType(const DIType *Ty, uint32_t &TypeId) {
   if (Tag != dwarf::DW_TAG_structure_type || CTy->isForwardDecl())
     return;
 
-  // Visit all struct members to ensure pointee type is visited
+  // Visit all struct members to ensure their types are visited.
   const DINodeArray Elements = CTy->getElements();
+  // In Aya/Rust, BPF maps are wrapped into nested types. Such wrapper types
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tamird wrote:

This is a bit too specific, no? I'd try to avoid mentioning this so specifically.

https://github.com/llvm/llvm-project/pull/144097