Enable PRODUCT_ART_USE_READ_BARRIER by default.

Bug: 34084559
Bug: 34576638
Test: Boot gce_x86_phone on master
Change-Id: If284beb9551e55a4a698679399feb26e4acfd3d9
diff --git a/core/soong_config.mk b/core/soong_config.mk
index 7b1be47..d987254 100644
--- a/core/soong_config.mk
+++ b/core/soong_config.mk
@@ -65,7 +65,7 @@
 	echo '    "Safestack": $(if $(filter true,$(USE_SAFESTACK)),true,false),'; \
 	echo '    "EnableCFI": $(if $(filter true,$(ENABLE_CFI)),true,false),'; \
 	echo ''; \
-	echo '    "ArtUseReadBarrier": $(if $(filter true,$(PRODUCT_ART_USE_READ_BARRIER)),true,false),'; \
+	echo '    "ArtUseReadBarrier": $(if $(filter false,$(PRODUCT_ART_USE_READ_BARRIER)),false,true),'; \
 	echo ''; \
 	echo '    "BtConfigIncludeDir": "$(BOARD_BLUETOOTH_BDROID_BUILDCFG_INCLUDE_DIR)",'; \
 	echo '    "BtHcilpIncluded": "$(BOARD_BLUETOOTH_BDROID_HCILP_INCLUDED)",'; \