Update downgrade_ir_for_chess after llvm update

[fifield]

llvm/llvm-project#123181 replaces nocapture with capture(none), which causes a problem for chess, giving errors like:

input.llchesshack.ll:74:52: error: expected ')' at end of argument list
declare <8 x float> @llvm.masked.load.v8f32.p0(ptr captures(none), i32 immarg, <8 x i1>, <8 x float>) #1
                                                   ^

For example https://github.com/Xilinx/mlir-aie/actions/runs/13077904662/job/36494451051

[keryell]

Does this depend on the Vitis version by the way? Do we assume that MLIR AIE will work only for a specific version of Vitis? 🤔

[fifield]

Does this depend on the Vitis version by the way? Do we assume that MLIR AIE will work only for a specific version of Vitis? 🤔

Yes this is a good point. For new enough versions of chess downgrade_ir_for_chess does not need to be called. I don't know which, if any, versions of Vitis contain such versions of chess.