ART: Switch Checker run-tests to Jack

Bug: 25635944
Change-Id: Ic6774028025b51f54589e9625003e8f69cf39dea
diff --git a/test/run-test b/test/run-test
index f1875d7..d0f93b9 100755
--- a/test/run-test
+++ b/test/run-test
@@ -677,11 +677,7 @@
 # Tests named '<number>-checker-*' will also have their CFGs verified with
 # Checker when compiled with Optimizing on host.
 if [[ "$TEST_NAME" =~ ^[0-9]+-checker- ]]; then
-  # Jack does not necessarily generate the same DEX output than dx. Because these tests depend
-  # on a particular DEX output, keep building them with dx for now (b/19467889).
-  USE_JACK="false"
-
-  if [ "$runtime" = "art" -a "$image_suffix" = "-optimizing" ]; then
+  if [ "$runtime" = "art" -a "$image_suffix" = "-optimizing" -a "$USE_JACK" = "true" ]; then
     # Optimizing has read barrier support for certain architectures
     # only. On other architectures, compiling is disabled when read
     # barriers are enabled, meaning that we do not produce a CFG file