[clang] [clang] Implement CWG2428 "Deprecating a concept" (PR #92295)

[via cfe-commits]

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@@ -8092,6 +8092,18 @@ void Sema::checkCall(NamedDecl *FDecl, const FunctionProtoType *Proto,
     diagnoseArgDependentDiagnoseIfAttrs(FD, ThisArg, Args, Loc);
 }
 
+void Sema::CheckConstrainedAuto(TypeSourceInfo *TS) {
+  if (getLangOpts().CPlusPlus20) {
+    if (const AutoType *AutoT = TS->getType()->getAs<AutoType>()) {
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cor3ntin wrote:

I think this check should be kept on the call site and the function can take an `AutoType` as parameter

https://github.com/llvm/llvm-project/pull/92295