Use the JIT RegExp engine rather than the interpreted version.

Fix b/2566479 and improve performance somewhat. :)

Change-Id: I5418db2cb5283c83bc7a762d2790af45f6ac8b9a
diff --git a/Android.libv8.mk b/Android.libv8.mk
index 850df3a..557cbd4 100644
--- a/Android.libv8.mk
+++ b/Android.libv8.mk
@@ -60,7 +60,8 @@
 	-Wno-import \
 	-Wno-format \
 	-fno-exceptions \
-	-DENABLE_DEBUGGER_SUPPORT
+	-DENABLE_DEBUGGER_SUPPORT \
+	-DV8_NATIVE_REGEXP
 
 ifeq ($(TARGET_ARCH),arm)
 	LOCAL_CFLAGS += -DARM -DV8_TARGET_ARCH_ARM