[clang] [Clang] Fix __is_array returning true for zero-sized arrays (PR #86652)

[Aaron Ballman via cfe-commits]

================
@@ -5143,6 +5143,10 @@ static bool EvaluateUnaryTypeTrait(Sema &Self, TypeTrait 
UTT,
   case UTT_IsFloatingPoint:
     return T->isFloatingType();
   case UTT_IsArray:
+    // zero-sized arrays aren't considered arrays in partial specializations,
----------------
AaronBallman wrote:

```suggestion
    // Zero-sized arrays aren't considered arrays in partial specializations,
```

https://github.com/llvm/llvm-project/pull/86652
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