ExtendStorageStub added, it is aimed for extending objects backing store when it runs out of space.

src/arm/interface-descriptors-arm.cc

Index: src/arm/interface-descriptors-arm.cc
diff --git a/src/arm/interface-descriptors-arm.cc b/src/arm/interface-descriptors-arm.cc
index 9bbc1f58c12860581ccb0f20c19e98eb72194b0e..ea79c90e64d2f3496287054c9759ceb0513fb4ba 100644
--- a/src/arm/interface-descriptors-arm.cc
+++ b/src/arm/interface-descriptors-arm.cc
@@ -27,6 +27,9 @@ const Register VectorLoadICDescriptor::VectorRegister() { return r3; }
 const Register StoreDescriptor::ReceiverRegister() { return r1; }
 const Register StoreDescriptor::NameRegister() { return r2; }
 const Register StoreDescriptor::ValueRegister() { return r0; }
+const Register ExtendStorageDescriptor::MapRegister() {
+  return StoreDescriptor::NameRegister();
+}
 
 
 const Register ElementTransitionAndStoreDescriptor::MapRegister() { return r3; }