Pass the right CFLAGS to libarttest(d).

bug:28406866
Change-Id: If063bfda90786f58e2dba68fe1b96a668e7db177
diff --git a/test/Android.libarttest.mk b/test/Android.libarttest.mk
index feee7c2..8598474 100644
--- a/test/Android.libarttest.mk
+++ b/test/Android.libarttest.mk
@@ -87,7 +87,11 @@
   LOCAL_ADDITIONAL_DEPENDENCIES += $(LOCAL_PATH)/Android.libarttest.mk
   ifeq ($$(art_target_or_host),target)
     $(call set-target-local-clang-vars)
-    $(call set-target-local-cflags-vars,debug)
+    ifeq ($$(suffix),d)
+      $(call set-target-local-cflags-vars,debug)
+    else
+      $(call set-target-local-cflags-vars,ndebug)
+    endif
     LOCAL_SHARED_LIBRARIES += libdl
     LOCAL_MULTILIB := both
     LOCAL_MODULE_PATH_32 := $(ART_TARGET_TEST_OUT)/$(ART_TARGET_ARCH_32)