[MLIR] [Python] Add Operation.parent

[jdd]

Summary

Attribute to get the parent operation of an operation.

[jdd]

Adding test

[stellaraccident]

Thanks!

mlir/lib/Bindings/Python/IRCore.cpp

void mlir::python::populateIRCore(py::module &m) {
   py::class_<PyOperation, PyOperationBase>(m, "Operation")
       .def_static("create", &PyOperation::create, py::arg("name"),
                   py::arg("results") = py::none(),
                   py::arg("operands") = py::none(),
                   py::arg("attributes") = py::none(),
                   py::arg("successors") = py::none(), py::arg("regions") = 0,
                   py::arg("loc") = py::none(), py::arg("ip") = py::none(),
                   kOperationCreateDocstring)
+      .def_property_readonly("parent",
+                             [](PyOperation &self) {
+                               return self.getParentOperation().getObject();
+                             })
       .def("erase", &PyOperation::erase)
       .def_property_readonly(MLIR_PYTHON_CAPI_PTR_ATTR,
                              &PyOperation::getCapsule)
       .def(MLIR_PYTHON_CAPI_FACTORY_ATTR, &PyOperation::createFromCapsule)
       .def_property_readonly("name",
                              [](PyOperation &self) {
                                self.checkValid();
                                MlirOperation operation = self.get();