[clang-tools-extra] [clang-doc] fix flaky test in clang-doc (PR #101387)

[Paul Kirth via cfe-commits]

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@@ -270,10 +273,12 @@ struct Info {
 
   virtual ~Info() = default;
 
+  Info &operator=(Info &&Other) = default;
+
   SymbolID USR =
       SymbolID(); // Unique identifier for the decl described by this Info.
-  const InfoType IT = InfoType::IT_default; // InfoType of this particular Info.
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ilovepi wrote:

Why drop `const`?

https://github.com/llvm/llvm-project/pull/101387