[clang] [llvm] [mlir] [AMDGPU] Add the support for 45-bit buffer resource (PR #159702)

[Krzysztof Drewniak via cfe-commits]

https://github.com/krzysz00 approved this pull request.

Approved here, though we might want another MLIR reviewer

https://github.com/llvm/llvm-project/pull/159702