[clang] [Clang] Throw error when calling atomic with pointer to zero size object (PR #91057)

[Aaron Ballman via cfe-commits]

================
@@ -8544,6 +8546,13 @@ ExprResult Sema::BuildAtomicExpr(SourceRange CallRange, 
SourceRange ExprRange,
     }
   }
 
+  // pointer to object of size zero is not allowed
----------------
AaronBallman wrote:

```suggestion
  // Pointer to object of size zero is not allowed.
```

https://github.com/llvm/llvm-project/pull/91057
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