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..cc4b000a61fec9cc5f87b89de408465114a84b67 100644
--- a/src/arm/interface-descriptors-arm.cc
+++ b/src/arm/interface-descriptors-arm.cc
@@ -29,6 +29,9 @@ const Register StoreDescriptor::NameRegister() { return r2; }
 const Register StoreDescriptor::ValueRegister() { return r0; }
 
 
+const Register ExtendStorageDescriptor::MapRegister() { return r3; }
+
+
 const Register ElementTransitionAndStoreDescriptor::MapRegister() { return r3; }