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e6f30334 - [Clang][AMDGPU][Docs] Add builtin documentation for AMDGPU builtins (#181574)

[Clang][AMDGPU][Docs] Add builtin documentation for AMDGPU builtins (#181574) Use the documentation generation infrastructure to document the AMDGPU builtins. This PR starts with the ABI / Special Register builtins. Documentation for the remaining builtin categories will be added incrementally in follow-up patches.