Only enable asserts on userdebug/eng builds.

Bug: 27699194
Change-Id: Id20f808448ae94371da62d38387f90ad97e7cbd3
diff --git a/Android.mk b/Android.mk
index d5e48b5..3197abd 100644
--- a/Android.mk
+++ b/Android.mk
@@ -31,9 +31,13 @@
   --extra-packages android.support.v7.recyclerview
 
 LOCAL_JACK_FLAGS := \
-  -D jack.assert.policy=enable \
   -D jack.optimization.inner-class.accessors=true
 
+# Only enable asserts on userdebug/eng builds
+ifneq (,$(filter userdebug eng, $(TARGET_BUILD_VARIANT)))
+LOCAL_JACK_FLAGS += -D jack.assert.policy=enable
+endif
+
 LOCAL_PACKAGE_NAME := DocumentsUI
 LOCAL_CERTIFICATE := platform