[mlir][python] Update `PyOpResult.owner` to get the parent object.

[mikeurbach]

Summary

Previously, this API would return the PyObjectRef, rather than the
underlying PyOperation.

[mikeurbach]

Rebase main

mlir/lib/Bindings/Python/IRCore.cpp

public:
   using PyConcreteValue::PyConcreteValue;
 
   static void bindDerived(ClassTy &c) {
     c.def_property_readonly("owner", [](PyOpResult &self) {
       assert(
           mlirOperationEqual(self.getParentOperation()->get(),
                              mlirOpResultGetOwner(self.get())) &&
           "expected the owner of the value in Python to match that in the IR");
-      return self.getParentOperation();
+      return self.getParentOperation().getObject();
     });
     c.def_property_readonly("result_number", [](PyOpResult &self) {
       return mlirOpResultGetResultNumber(self.get());
     });
   }
 };
 
 /// A list of block arguments. Internally, these are stored as consecutive

mlir/test/Bindings/Python/ir_value.py

with Location.unknown(ctx):
     value = Operation.create("custom.op1", results=[i32]).result
     value_capsule = value._CAPIPtr
     assert '"mlir.ir.Value._CAPIPtr"' in repr(value_capsule)
     value2 = Value._CAPICreate(value_capsule)
     assert value2 == value
 
 
 run(testCapsuleConversions)
+
+
+# CHECK-LABEL: TEST: testOpResultOwner
+def testOpResultOwner():
+  ctx = Context()
+  ctx.allow_unregistered_dialects = True
+  with Location.unknown(ctx):
+    i32 = IntegerType.get_signless(32)
+    op = Operation.create("custom.op1", results=[i32])
+    assert op.result.owner == op
+
+
+run(testOpResultOwner)