ART: Silence core image creation

Only report errors.

Test: art/test/testrunner/testrunner.py -b --host -t 001-HelloWorld
Change-Id: I987638f0fac871b28bf472001414742981226ce3
diff --git a/build/Android.oat.mk b/build/Android.oat.mk
index ba3ef05..08b1e10 100644
--- a/build/Android.oat.mk
+++ b/build/Android.oat.mk
@@ -96,7 +96,7 @@
 $$(core_image_name): $$(HOST_CORE_DEX_LOCATIONS) $$(core_dex2oat_dependency)
 	@echo "host dex2oat: $$@"
 	@mkdir -p $$(dir $$@)
-	$$(hide) $$(DEX2OAT) --runtime-arg -Xms$(DEX2OAT_IMAGE_XMS) \
+	$$(hide) ANDROID_LOG_TAGS="*:e" $$(DEX2OAT) --runtime-arg -Xms$(DEX2OAT_IMAGE_XMS) \
 	  --runtime-arg -Xmx$(DEX2OAT_IMAGE_XMX) \
 	  --image-classes=$$(PRELOADED_CLASSES) $$(addprefix --dex-file=,$$(HOST_CORE_DEX_FILES)) \
 	  $$(addprefix --dex-location=,$$(HOST_CORE_DEX_LOCATIONS)) --oat-file=$$(PRIVATE_CORE_OAT_NAME) \