[clang] [clang][CUDA] Allow `extern __shared__` on non-array types (PR #183879)

[Yaxun Liu via cfe-commits]

yxsamliu wrote:

Could you add a small non-RDC CodeGen test that accesses a shared struct and fixed-size array and checks their emitted types and shared address space? A HIP test would also help, since this handler affects HIP too.


https://github.com/llvm/llvm-project/pull/183879