Move to dynamic dispatch. Add support for IoAllocation* in rs.spec.

Change-Id: I013409cbb758ce5aae78347acb39c43d07aeb9bf
diff --git a/rs.spec b/rs.spec
index 555aadd..aab3d46 100644
--- a/rs.spec
+++ b/rs.spec
@@ -391,5 +391,11 @@
     param RsScriptGroup group
 }
 
+AllocationIoSend {
+    param RsAllocation alloc
+    }
 
+AllocationIoReceive {
+    param RsAllocation alloc
+    }