[MLIR][GPU-LLVM] Convert `gpu.func` to `llvm.func` (#101664) Add support in `-convert-gpu-to-llvm-spv` to convert `gpu.func` to `llvm.func` operations. - `spir_kernel`/`spir_func` calling conventions used for kernels/functions. - `workgroup` attributions encoded as additional `llvm.ptr<3>` arguments. - No attribute used to annotate kernels - `reqd_work_group_size` attribute using to encode `gpu.known_block_size`. - `llvm.mlir.workgroup_attrib_size` used to encode workgroup attribution sizes. This will be attached to the pointer argument workgroup attributions lower to. **Note**: A notable missing feature that will be addressed in a follow-up PR is a `-use-bare-ptr-memref-call-conv` option to replace MemRef arguments with bare pointers to the MemRef element types instead of the current MemRef descriptor approach. --------- Signed-off-by: Victor Perez <victor.perez@codeplay.com>
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