[MooreToCore] VariableOp lowered failed

[mingzheTerapines]

Dear @maerhart @fabianschuiki , When lowering SV to Hw Dialect, there is a stack dump. Driver: circt-verilog %s

module top();
  typedef struct {
    int a;
    int b;
  } ms_t;

  ms_t ms;

  initial begin
    ms = '{ 0, 1};

    ms = '{ default:1, int:1};

    ms = '{ int:0, int:1};
  end

endmodule

It can be converted to moore Dialect like this Driver: circt-verilog --ir-moore %s

module {
  moore.module @top() {
    %0 = moore.constant 1 : i32
    %1 = moore.constant 0 : i32
    %ms = moore.variable : <ustruct<{a: i32, b: i32}>>
    moore.procedure initial {
      %2 = moore.struct_create %1, %0 : !moore.i32, !moore.i32 -> ustruct<{a: i32, b: i32}>
      moore.blocking_assign %ms, %2 : ustruct<{a: i32, b: i32}>
      %3 = moore.struct_create %0, %0 : !moore.i32, !moore.i32 -> ustruct<{a: i32, b: i32}>
      moore.blocking_assign %ms, %3 : ustruct<{a: i32, b: i32}>
      moore.blocking_assign %ms, %3 : ustruct<{a: i32, b: i32}>
      moore.return
    }
    moore.output
  }
}

But it got stack dump when casting hw::InOutType. Maybe structType should be converted somehow. This is part of error codes.

#19 0x00005f9660f42af4 (anonymous namespace)::OperationLegalizer::legalizeWithPattern(mlir::Operation*, mlir::ConversionPatternRewriter&) /home/pluto/Documents/circt/circt/llvm/mlir/lib/Transforms/Utils/DialectConversion.cpp:1958:21
#20 0x00005f9660f3b100 (anonymous namespace)::OperationLegalizer::legalize(mlir::Operation*, mlir::ConversionPatternRewriter&) /home/pluto/Documents/circt/circt/llvm/mlir/lib/Transforms/Utils/DialectConversion.cpp:1850:17
#21 0x00005f9660f3aa73 mlir::OperationConverter::convert(mlir::ConversionPatternRewriter&, mlir::Operation*) /home/pluto/Documents/circt/circt/llvm/mlir/lib/Transforms/Utils/DialectConversion.cpp:2384:26
#22 0x00005f9660f3b41f mlir::OperationConverter::convertOperations(llvm::ArrayRef<mlir::Operation*>) /home/pluto/Documents/circt/circt/llvm/mlir/lib/Transforms/Utils/DialectConversion.cpp:2436:16
#23 0x00005f9660f3fdfc mlir::applyFullConversion(llvm::ArrayRef<mlir::Operation*>, mlir::ConversionTarget const&, mlir::FrozenRewritePatternSet const&, mlir::ConversionConfig) /home/pluto/Documents/circt/circt/llvm/mlir/lib/Transforms/Utils/DialectConversion.cpp:3447:22
#24 0x00005f9660f3fe9d mlir::applyFullConversion(mlir::Operation*, mlir::ConversionTarget const&, mlir::FrozenRewritePatternSet const&, mlir::ConversionConfig) /home/pluto/Documents/circt/circt/llvm/mlir/lib/Transforms/Utils/DialectConversion.cpp:3453:10
#25 0x00005f965faed60d (anonymous namespace)::MooreToCorePass::runOnOperation() /home/pluto/Documents/circt/circt/lib/Conversion/MooreToCore/MooreToCore.cpp:1398:14