[clang] [Clang/AMDGPU] Allow zero sized arrays in HIP device code (PR #195716)

[Joseph Huber via cfe-commits]

jhuber6 wrote:

> Right, so this should be allowed.

I could see a warning maybe, that `[]` is not `[0]` for LDS. But overall I think this is "working as expected" and we shouldn't restrict this just because NVCC does.

https://github.com/llvm/llvm-project/pull/195716