Harmony: Use slow-debug for debug JDWP tests

Enable slow debug checks in the runtime for JDWP tests. Brings
the Makefile in line with art/tools/run-jdwp-tests.sh.

Bug: 35644369
Test: m
Change-Id: Icdbae9be840b221b0509db53412b697613859d7c
diff --git a/jdwp/Android_debug_config.mk b/jdwp/Android_debug_config.mk
index 8d89cb3..7f679ea 100644
--- a/jdwp/Android_debug_config.mk
+++ b/jdwp/Android_debug_config.mk
@@ -28,7 +28,7 @@
 jdwp_test_runtime_bin_host := $(HOST_OUT_EXECUTABLES)/art
 
 # Common runtime settings for runner and debuggee.
-jdwp_test_common_runtime_options := -XXlib:libartd.so -Xcompiler-option --debuggable
+jdwp_test_common_runtime_options := -XXlib:libartd.so -XX:SlowDebug=true -Xcompiler-option --debuggable
 
 # Debuggee runtime options
 jdwp_test_runtime_options := -verbose:jdwp