[clang] [llvm] [Amdgpu] adding tests to see outcomes before getaddrspacecastpreserved ptr mask implementation (PR #195277)

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addmisol wrote:

@shiltian, can you please merge this pr as I do not have write access currently,
then can we see the diff in this pr https://github.com/llvm/llvm-project/pull/182658

https://github.com/llvm/llvm-project/pull/195277