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The MLIR LLVM dialect is missing support for several parameter attributes that exist in LLVM IR: `writable`, `dead_on_unwind`, `dead_on_return`, and `nofpclass`. This adds them to the kind-to-name mapping in `AttrKindDetail.h` and the corresponding name accessors in `LLVMDialect.td`. The existing generic conversion infrastructure in `ModuleTranslation` and `ModuleImport` picks them up automatically — `writable` and `dead_on_unwind` round-trip as `UnitAttr`, while `dead_on_return` and `nofpclass` round-trip as `IntegerAttr`. CIR needs these to match classic codegen's ABI output (sret gets `writable dead_on_unwind`, indirect args get `dead_on_return`, fast-math FP args get `nofpclass`).
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