ART: Rename graph dump file name to 'graph.cfg'

Change-Id: I91f6a6bf5efac5b3bba92b9a89e22e1b7be6e02f
diff --git a/test/run-test b/test/run-test
index 12b743d..ed33099 100755
--- a/test/run-test
+++ b/test/run-test
@@ -75,7 +75,7 @@
 check_cmd="check"
 output="output.txt"
 build_output="build-output.txt"
-cfg_output="cfg-output.txt"
+cfg_output="graph.cfg"
 lib="libartd.so"
 run_args="--quiet"
 build_args=""