[CIR][AMDGPU] Adds lowering for amdgcn raw buffer load/store and atomics #2075
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Support for lowering of
__builtin_amdgcn_raw_buffer_load/store/atomicfor AMDGPU builtins to clangIR.Followed similar lowering from clang->llvmir: clang/lib/CodeGen/TargetBuiltins/AMDGPU.cpp.