[mlir][GPU] Refactor GPUOps lowering (#188905) This change promotes `gpu.func` / `gpu.launch` metadata that was previously carried as discardable attributes into proper inherent ODS fields (`kernel`, `workgroup_attributions`), renames the block-argument helpers to avoid clashing with generated getters, and routes `func.func` and `gpu.func` lowering through a shared helper that maps discardable `llvm.*` attributes into `llvm.func` properties. Downstream producers (Flang CUDA device func transform, kernel outlining, sparse GPU codegen, XeGPU) set kernels via `setKernel(true)` instead of manually attaching `gpu.kernel`. Fixes #185174 Assisted-by: CLion code completion, GPT 5.3 - Codex
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