Change FunctionAttributes.Coroutine to 0x80

Author: slozier

src/core/IronPython/Runtime/FunctionAttributes.cs

@@ -25,7 +25,7 @@ public enum FunctionAttributes {
         /// <summary>
         /// Set if the function is a coroutine (async def).
         /// </summary>
-        Coroutine = 0x100,
+        Coroutine = 0x80,
         /// <summary>
         /// IronPython specific: Set if the function includes nested exception handling and therefore can alter
         /// sys.exc_info().