[clang-tools-extra] [clang-tidy] Handle auto&& in missing-std-forward (PR #220164)

[Zeyi Xu via cfe-commits]

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@@ -0,0 +1,24 @@
+// RUN: %check_clang_tidy -std=c++20-or-later %s cppcoreguidelines-missing-std-forward %t -- -- -fno-delayed-template-parsing
+
+#include <utility>
+
+void does_not_forward_auto(auto &&t) {
+  // CHECK-MESSAGES: :[[@LINE-1]]:35: warning: forwarding reference parameter 't' is never forwarded inside the function body [cppcoreguidelines-missing-std-forward]
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zeyi2 wrote:

Nit:

```suggestion
  // CHECK-MESSAGES: :[[@LINE-1]]:35: warning: forwarding reference parameter 't' is never forwarded inside the function body
```

Same as below

https://github.com/llvm/llvm-project/pull/220164