Implement int.as_integer_ratio

Author: otethal

graalpython/com.oracle.graal.python/src/com/oracle/graal/python/builtins/objects/ints/IntBuiltins.java

@@ -2457,6 +2457,15 @@ int get(@SuppressWarnings("unused") Object self) {
         }
     }
 
+    @GenerateNodeFactory
+    @Builtin(name = "as_integer_ratio", minNumOfPositionalArgs = 1, doc = "Return integer ratio.")
+    abstract static class AsIntegerRatioNode extends PythonBuiltinNode {
+        @Specialization
+        Object get(VirtualFrame frame, Object self, @Cached IntNode intNode) {
+            return factory().createTuple(new Object[]{intNode.execute(frame, self), 1});
+        }
+    }
+
     @GenerateNodeFactory
     @Builtin(name = SpecialMethodNames.__TRUNC__, minNumOfPositionalArgs = 1, doc = "Truncating an Integral returns itself.")
     abstract static class TruncNode extends IntNode {