[HWArith] Lowering to HW with type aliases

[teqdruid]

hw.type_scope @pycde {
  hw.typedecl @MMIOIntermediateCmd : !hw.struct<offset: ui32>
}
hw.module @MMIOAxiReadWriteMux(out cmd : !hw.typealias<@pycde::@MMIOIntermediateCmd, !hw.struct<offset: ui32>>) {
  %2 = hw.constant 0 : i32
  %3 = hwarith.cast %2 : (i32) -> ui32
  %4 = hw.struct_create (%3) : !hw.typealias<@pycde::@MMIOIntermediateCmd, !hw.struct<offset: ui32>>
  hw.output %4: !hw.typealias<@pycde::@MMIOIntermediateCmd, !hw.struct<offset: ui32>>
}

$ circt-opt hwarith_debug.mlir --lower-hwarith-to-hw
hwarith_debug.mlir:7:8: error: 'hw.struct_create' op structure field `"offset"` type does not match
  %4 = hw.struct_create (%3) : !hw.typealias<@pycde::@MMIOIntermediateCmd, !hw.struct<offset: ui32>>
       ^
hwarith_debug.mlir:7:8: note: see current operation: %1 = "hw.struct_create"(%0) : (i32) -> !hw.typealias<@pycde::@MMIOIntermediateCmd, !hw.struct<offset: ui32>>

[teqdruid]

This was actually a relatively easy issue to fix. PR coming.