[clang] [llvm] [CUDA][NVPTX] Add dp4a/dp2a builtins; define CUDA-13.4's __nv_idp*_impl externs (PR #233434)

[Ilya Biryukov via cfe-commits]

https://github.com/ilya-biryukov auto_merge_enabled 
https://github.com/llvm/llvm-project/pull/233434
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