[clang] [HLSL] make the default address space a superset of the hlsl_groupshared address space (PR #182094)

[Justin Bogner via cfe-commits]

https://github.com/bogner approved this pull request.

I think this is right. The naming of `isTargetAddressSpaceSupersetOf` kind of makes me feel like we're abusing this logic a little bit, but the existing comment for HLSL also applies here so at the very least adding groupshared here seems harmless.

https://github.com/llvm/llvm-project/pull/182094