[mpact][compiler] add missing mpact comment to tests (#49)

test/python/gat.py

diff --git a/test/python/gat.py b/test/python/gat.py
index 64a2e7f..283c36f 100644
--- a/test/python/gat.py
+++ b/test/python/gat.py
@@ -43,6 +43,7 @@
     res = net(S, adj_mat)
     print(res)
 
+    # Run it with MPACT.
     print("mpact gat")
     res = mpact_jit(net, S, adj_mat)
     print(res)

test/python/gcn.py

diff --git a/test/python/gcn.py b/test/python/gcn.py
index e51f7cf..0453f83 100644
--- a/test/python/gcn.py
+++ b/test/python/gcn.py
@@ -89,6 +89,7 @@
     res = net(S, adj_mat)
     print(res)
 
+    # Run it with MPACT.
     print("mpact gcn")
     res = mpact_jit(net, S, adj_mat)
     print(res)