Make test work when running ndebug.

Change-Id: Iea58ccef51fddaeae4b1fb7084a7956400a81dfe
Test: ART_TEST_RUN_TEST_NDEBUG=true mma -j40 test-art-host-run-test-900-hello-plugin
diff --git a/test/etc/run-test-jar b/test/etc/run-test-jar
index 0ea5d52..d12bd79 100755
--- a/test/etc/run-test-jar
+++ b/test/etc/run-test-jar
@@ -60,6 +60,9 @@
     if [ "x$1" = "x--quiet" ]; then
         QUIET="y"
         shift
+    elif [ "x$1" = "x-O" ]; then
+        # Ignore this option.
+        shift
     elif [ "x$1" = "x--lib" ]; then
         shift
         if [ "x$1" = "x" ]; then