Use debug versions of dex2oat explicitly.

Change-Id: Ie7c238908a5739af752a08fec1a04914026a8f96
diff --git a/core/dex_preopt.mk b/core/dex_preopt.mk
index 4918a2b..46a6479 100644
--- a/core/dex_preopt.mk
+++ b/core/dex_preopt.mk
@@ -65,7 +65,7 @@
 $(call dex2oat-one-file,$(1),$(2),$(3),$(4))
 endef
 
-DEXPREOPT_ONE_FILE_DEPENDENCY_TOOLS := $(DEX2OAT_DEPENDENCY)
+DEXPREOPT_ONE_FILE_DEPENDENCY_TOOLS := $(DEX2OATD_DEPENDENCY)
 DEXPREOPT_ONE_FILE_DEPENDENCY_BUILT_BOOT_PREOPT := $(DEFAULT_DEX_PREOPT_BUILT_IMAGE)
 endif
 else