[clang] [Clang] Implement C++26’s P2893R3 ‘Variadic friends’ (PR #101448)

[Younan Zhang via cfe-commits]

================
@@ -754,6 +754,10 @@ static void InitializeCPlusPlusFeatureTestMacros(const 
LangOptions &LangOpts,
     Builder.defineMacro("__cpp_multidimensional_subscript", "202211L");
     Builder.defineMacro("__cpp_auto_cast", "202110L");
   }
+  // C++26 features.
+  if (LangOpts.CPlusPlus26) {
+    Builder.defineMacro("__cpp_variadic_friend", "202403L");
+  }
----------------
zyn0217 wrote:

I thought we already had an umbrella for C++26 features e.g. pack indexing 
expressions... @cor3ntin is it an oversight?

https://github.com/llvm/llvm-project/pull/101448
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