[clang] [clang] Fix ASTWriter crash after merging named enums (PR #114240)

[via cfe-commits]

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@@ -4034,6 +4034,12 @@ class Sema final : public SemaBase {
   void MergeTypedefNameDecl(Scope *S, TypedefNameDecl *New,
                             LookupResult &OldDecls);
 
+  /// RetireNodesFromMergedDecl - We have just merged the decl 'New' by making
+  /// another definition visible.
+  /// This method performs any necessary cleanup on the parser state to discard
+  /// child nodes from newly parsed decl we are retiring.
+  void RetireNodesFromMergedDecl(Scope *S, Decl *New);
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cor3ntin wrote:

```suggestion
  void CleanupMergedEnum(Scope *S, Decl *New);
```
Maybe something like that is clearer

https://github.com/llvm/llvm-project/pull/114240