[llvm] [AMDGPU] Add named operands to SI_CALL_ISEL (PR #192196)

[Robert Imschweiler via llvm-commits]

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ro-i wrote:

I don't think that's how tablegen tests are supposed to work? You shouldn't just grep for stuff in the source, but rather actually *use* tablegen and verify the bahvior. E.g., like https://github.com/llvm/llvm-project/blob/main/llvm/test/TableGen/get-named-operand-idx.td

https://github.com/llvm/llvm-project/pull/192196