[llvm] [AMDGPU] Handle natively unsupported types in addrspace(7) lowering (PR #110572)

[Krzysztof Drewniak via llvm-commits]

krzysz00 wrote:

Re the arrays, `vectorToArray` is for having loaded a vector and turning it back into an array so that you can RAUW in that array.

https://github.com/llvm/llvm-project/pull/110572