[llvm] [RemoveDIs][DebugInfo] Verifier and printing fixes for DPLabel (PR #83242)

[Orlando Cazalet-Hyams via llvm-commits]

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@@ -69,6 +69,53 @@ class DPMarker;
 class DPValue;
 class raw_ostream;
 
+/// A typed tracking MDNode reference that does not require a definition for its
+/// parameter type. Necessary to avoid including DebugInfoMetadata.h, which has
+/// a significant impact on compile times if included in this file.
+template <typename T> class DbgRecordParamRef {
+  TrackingMDNodeRef Ref;
+
+public:
+public:
+  DbgRecordParamRef() = default;
+
+  /// Construct from the templated type.
+  DbgRecordParamRef(const T *Param);
+
+  /// Construct from an \a MDNode.
+  ///
+  /// Note: if \c N does not have the template type, a verifier check will
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OCHyams wrote:

nit: should `N` in the comment be `Param`?

https://github.com/llvm/llvm-project/pull/83242