[clang] [Clang][Parser] Accept P2741R3 (static_assert with user-generated message) in C++11 as an extension (PR #102044)

[Mital Ashok via cfe-commits]

================
@@ -671,10 +671,8 @@ static void InitializeCPlusPlusFeatureTestMacros(const 
LangOptions &LangOpts,
                         LangOpts.CPlusPlus23   ? "202211L"
                         : LangOpts.CPlusPlus17 ? "201603L"
                                                : "200907");
-    Builder.defineMacro("__cpp_static_assert", LangOpts.CPlusPlus26 ? "202306L"
-                                               : LangOpts.CPlusPlus17
-                                                   ? "201411L"
-                                                   : "200410");
+    // C++17 / C++26 static_assert backported
+    Builder.defineMacro("__cpp_static_assert", "202306L");
----------------
MitalAshok wrote:
> I'm more thinking of stuff like this: https://godbolt.org/z/qzaMaP4sW.

That problem already exists for these macros:

https://github.com/llvm/llvm-project/blob/4f067dc467a1f97a1b6ac420926da8bab5f243bf/clang/lib/Frontend/InitPreprocessor.cpp#L758-L767

https://godbolt.org/z/nGqPb4Pvr


https://github.com/llvm/llvm-project/pull/102044
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