[clang] [clang] Implement P3176R1: The Oxford variadic comma (PR #117524)

[via cfe-commits]

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@@ -8119,6 +8119,14 @@ void Parser::ParseParameterDeclarationClause(
     }
 
     if (TryConsumeToken(tok::ellipsis, EllipsisLoc)) {
+      if (getLangOpts().CPlusPlus26) {
+        // C++26 [dcl.dcl.fct]p3:
+        //   A parameter-declaration-clause of the form
+        //   parameter-list '...' is deprecated
+        Diag(EllipsisLoc, diag::warn_deprecated_missing_comma_before_ellipsis)
+            << FixItHint::CreateInsertion(EllipsisLoc, ", ");
+      }
+
----------------
cor3ntin wrote:

below:  `else if (!getLangOpts().CPlusPlus) {` 

https://github.com/llvm/llvm-project/pull/117524
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