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

src/mips/interface-descriptors-mips.cc

Index: src/mips/interface-descriptors-mips.cc
diff --git a/src/mips/interface-descriptors-mips.cc b/src/mips/interface-descriptors-mips.cc
index 936ce20acc358138c314e910ab8ce45b88758e1a..070228ddd20d16422d36a8eec3139d0d3625c745 100644
--- a/src/mips/interface-descriptors-mips.cc
+++ b/src/mips/interface-descriptors-mips.cc
@@ -29,6 +29,9 @@ const Register StoreDescriptor::NameRegister() { return a2; }
 const Register StoreDescriptor::ValueRegister() { return a0; }
 
 
+const Register ExtendStorageDescriptor::MapRegister() { return a3; }
+
+
 const Register ElementTransitionAndStoreDescriptor::MapRegister() { return a3; }