Update V8 to r5017 as required by WebKit r62496

Change-Id: I1b4b7718d1d77ceef07f543e9150a2cb3a628f3a
diff --git a/src/factory.cc b/src/factory.cc
index 35d3c54..f6b93b0 100644
--- a/src/factory.cc
+++ b/src/factory.cc
@@ -274,11 +274,22 @@
   return copy;
 }
 
+
 Handle<Map> Factory::CopyMapDropTransitions(Handle<Map> src) {
   CALL_HEAP_FUNCTION(src->CopyDropTransitions(), Map);
 }
 
 
+Handle<Map> Factory::GetFastElementsMap(Handle<Map> src) {
+  CALL_HEAP_FUNCTION(src->GetFastElementsMap(), Map);
+}
+
+
+Handle<Map> Factory::GetSlowElementsMap(Handle<Map> src) {
+  CALL_HEAP_FUNCTION(src->GetSlowElementsMap(), Map);
+}
+
+
 Handle<FixedArray> Factory::CopyFixedArray(Handle<FixedArray> array) {
   CALL_HEAP_FUNCTION(array->Copy(), FixedArray);
 }