[clang] [clang-tools-extra] [Clang] Unify interface for accessing template arguments as written for class/variable template specializations (PR #81642)

[Erich Keane via cfe-commits]

================
@@ -2596,27 +2588,14 @@ class VarTemplateSpecializationDecl : public VarDecl,
   llvm::PointerUnion<VarTemplateDecl *, SpecializedPartialSpecialization *>
   SpecializedTemplate;
 
-  /// Further info for explicit template specialization/instantiation.
-  struct ExplicitSpecializationInfo {
-    /// The type-as-written.
-    TypeSourceInfo *TypeAsWritten = nullptr;
-
-    /// The location of the extern keyword.
-    SourceLocation ExternLoc;
-
-    /// The location of the template keyword.
-    SourceLocation TemplateKeywordLoc;
-
-    ExplicitSpecializationInfo() = default;
-  };
-
   /// Further info for explicit template specialization/instantiation.
   /// Does not apply to implicit specializations.
-  ExplicitSpecializationInfo *ExplicitInfo = nullptr;
+  llvm::PointerUnion<const ASTTemplateArgumentListInfo *,
----------------
erichkeane wrote:

Not a good one :)  Perhpas: `TemplateArgListInfoOrExplicitSpecInfo` ? 

https://github.com/llvm/llvm-project/pull/81642
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