Update V8 to r5318 to fix crashing ARM bugs

Bug: 2947054
Change-Id: I9c7398edb1525477c75ace9d383efaf790d12c51
diff --git a/src/serialize.h b/src/serialize.h
index 80be50d..92a5149 100644
--- a/src/serialize.h
+++ b/src/serialize.h
@@ -448,6 +448,7 @@
     void VisitPointers(Object** start, Object** end);
     void VisitExternalReferences(Address* start, Address* end);
     void VisitCodeTarget(RelocInfo* target);
+    void VisitCodeEntry(Address entry_address);
     void VisitRuntimeEntry(RelocInfo* reloc);
     // Used for seralizing the external strings that hold the natives source.
     void VisitExternalAsciiString(