[AMDGPU] TableGen-erate SDNode descriptions (#168248) This allows SDNodes to be validated against their expected type profiles and reduces the number of changes required to add a new node. Autogenerated node names start with "AMDGPUISD::", hence the changes in the tests. The few nodes defined in R600.td are *not* imported because TableGen processes AMDGPU.td that doesn't include R600.td. Ideally, we would have two sets of nodes, but that would require careful reorganization of td files since some nodes are shared between AMDGPU/R600. Not sure if it something worth looking into. Some nodes fail validation, those are listed in `AMDGPUSelectionDAGInfo::verifyTargetNode()`. Part of #119709. Pull Request: https://github.com/llvm/llvm-project/pull/168248
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