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

[Nikolas Klauser via cfe-commits]

philnik777 wrote:

Another option would be to to not acknowledge zero-sized arrays in the type traits at all, just like vector types: https://godbolt.org/z/aP685vz8q. That may be the most consistent stance on this. Basically "It's non-standard and doesn't fit neatly in any of the standard categories, so it's in no category at all."

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