Failed to compile onnx.Resize with dynamic shapes

[jinchen62]

Got the following error when lowering onnx.Resize with dynamic shapes.

error: failed to legalize operation 'arith.sitofp' that was explicitly marked illegal

Reproducer:

func.func @repro(%arg0: !torch.vtensor<[?,1280,?,?],f32>, %arg1: !torch.vtensor<[4],f32>) -> !torch.vtensor<[?,1280,?,?],f32> attributes {torch.onnx_meta.ir_version = 9 : si64, torch.onnx_meta.opset_version = 19 : si64, torch.onnx_meta.producer_name = "backend-test", torch.onnx_meta.producer_version = ""} {
  %none = torch.constant.none
  %0 = torch.operator "onnx.Resize"(%arg0, %none, %arg1) {torch.onnx.coordinate_transformation_mode = "asymmetric", torch.onnx.mode = "nearest", torch.onnx.nearest_mode = "floor"} : (!torch.vtensor<[?,1280,?,?],f32>, !torch.none, !torch.vtensor<[4],f32>) -> !torch.vtensor<[?,1280,?,?],f32>
  return %0 : !torch.vtensor<[?,1280,?,?],f32>
}

Commands:

torch-mlir-opt --torch-onnx-to-torch-backend-pipeline --convert-torch-to-linalg repro.mlir -o repro_linalg.mlir
iree-compile --iree-hal-target-backends=llvm-cpu --iree-llvmcpu-target-cpu=host repro_linalg.mlir -o test.vmfb

It's failing at https://github.com/llvm/torch-mlir/blob/main/lib/Conversion/TorchToLinalg/Uncategorized.cpp#L3187 when trying to convert the dynamic input shape to float for multiplying with scales.