Revert "Do not dexopt core-libart"

This reverts commit a8f7639cb7dee119543ed7db0c219e300c11e951.

Change-Id: I5b5cda6db9de756f7b7aa01e5098b6737262fced
diff --git a/JavaLibrary.mk b/JavaLibrary.mk
index 8337ab2..4b5fbcd 100644
--- a/JavaLibrary.mk
+++ b/JavaLibrary.mk
@@ -97,9 +97,6 @@
 LOCAL_MODULE := core-libart
 LOCAL_ADDITIONAL_DEPENDENCIES := $(LOCAL_PATH)/JavaLibrary.mk
 LOCAL_REQUIRED_MODULES := tzdata
-# Should not be dex-preopted as it isn't really a Dalvik boot jar or a
-# regular java library, but part of the image for ART.
-LOCAL_DEX_PREOPT := false
 include $(BUILD_JAVA_LIBRARY)
 
 ifeq ($(LIBCORE_SKIP_TESTS),)
@@ -192,9 +189,6 @@
     LOCAL_MODULE := core-libart-hostdex
     LOCAL_ADDITIONAL_DEPENDENCIES := $(LOCAL_PATH)/JavaLibrary.mk
     LOCAL_REQUIRED_MODULES := tzdata-host
-    # Should not be dex-preopted as it isn't really a Dalvik boot jar or a
-    # regular java library, but part of the image for ART.
-    LOCAL_DEX_PREOPT := false
     include $(BUILD_HOST_DALVIK_JAVA_LIBRARY)
 
     # Make the core-tests library.