Fix the handful of leaks detectable in our tests.

Change-Id: I74ad1a3831fbebad60ff24f0b3ac07cade823b7a
diff --git a/Android.mk b/Android.mk
index 7ddaa37..7e5555d 100644
--- a/Android.mk
+++ b/Android.mk
@@ -73,7 +73,7 @@
 # "mm valgrind-art-host" to build and run all host tests under valgrind.
 .PHONY: valgrind-art-host
 valgrind-art-host: $(ART_HOST_TEST_DEPENDENCIES)
-	$(call run-host-tests-with,"valgrind")
+	$(call run-host-tests-with,valgrind --leak-check=full)
 	@echo valgrind-art-host PASSED
 
 # "mm tsan-art-host" to build and run all host tests under tsan.