The test now uses libarttest.so, so fails in ndebug mode.

libarttest.so is linked against libartd.so, so running the
test with libart.so will fail.

Change-Id: I395d03b4b4e6b37d81c5066950afe521801410e4
diff --git a/test/Android.run-test.mk b/test/Android.run-test.mk
index e460f39..f74547b 100644
--- a/test/Android.run-test.mk
+++ b/test/Android.run-test.mk
@@ -279,6 +279,7 @@
   004-SignalTest \
   004-StackWalk \
   004-UnsafeTest \
+  051-thread \
   115-native-bridge \
   116-nodex2oat \
   117-nopatchoat \