[clang] [LifetimeSafety] Track origins for lifetimebound calls returning record types (PR #187917)

[Gábor Horváth via cfe-commits]

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@@ -178,6 +190,10 @@ class OriginManager {
   llvm::DenseMap<const clang::ValueDecl *, OriginList *> DeclToList;
   llvm::DenseMap<const clang::Expr *, OriginList *> ExprToList;
   std::optional<OriginList *> ThisOrigins;
+  /// Types that are not inherently pointer-like but require origin tracking
+  /// because they are returned from functions with [[clang::lifetimebound]]
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Xazax-hun wrote:

Small nit, I think these are not specific to `lifetimebound` only, `lifetime_capture_by` has similar effects. It is fine to not handle that in this PR, but I wonder if the comment should reflect this. 

https://github.com/llvm/llvm-project/pull/187917