[llvm] [clang-tools-extra] [clang] [clang] Add test for CWG472 (PR #67948)

[via llvm-commits]

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@@ -2871,7 +2871,7 @@ <h2 id="cxxdr">C++ defect report implementation status</h2>
     <td><a href="https://cplusplus.github.io/CWG/issues/472.html">472</a></td>
     <td>drafting</td>
     <td>Casting across protected inheritance</td>
-    <td align="center">Not resolved</td>
+    <td class="none" align="center">No</td>
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cor3ntin wrote:

> For `"no drafting" status, can we say something different here? I think something like "Not resolved, probably no" would be better, given that we don't actually know what the resolution will be, and if it ends up resolved NAD then we actually do implement it correctly :-)

I think that would make sense. Any opinion @AaronBallman ?

https://github.com/llvm/llvm-project/pull/67948