[clang] [HLSL] Add HLSL 202y language mode (PR #108437)

[Justin Bogner via cfe-commits]

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@@ -1347,6 +1347,8 @@ ExprResult Parser::ParseLambdaExpressionAfterIntroducer(
   Diag(LambdaBeginLoc, getLangOpts().CPlusPlus11
                            ? diag::warn_cxx98_compat_lambda
                            : diag::ext_lambda);
+  if (getLangOpts().HLSL)
+    Diag(LambdaBeginLoc, diag::ext_hlsl_lambda);
----------------
bogner wrote:

I think this will issue two warnings if someone specifies `-Wcxx98-compat` (for some reason...). Probably better to check the langopts for both c++11 and HLSL to figure out the right ID and then only call `Diag` once.

https://github.com/llvm/llvm-project/pull/108437