[clang] [clang] Improve diagnostic on [[nodiscard]] attribute (PR #112521)

[Erich Keane via cfe-commits]

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@@ -148,6 +148,19 @@ C++ Specific Potentially Breaking Changes
     // Now diagnoses with an error.
     void f(int& i [[clang::lifetimebound]]);
 
+- Clang will now prefer the ``[[nodiscard]]`` declaration on function declarations over ``[[nodiscard]]``
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erichkeane wrote:

I'm not sure this is really a 'potentially breaking change' so much as just a diagnostic change?  

https://github.com/llvm/llvm-project/pull/112521