Multiple stubs can point to the same calling convention.

src/ic/arm/ic-conventions-arm.cc

Index: src/ic/arm/ic-conventions-arm.cc
diff --git a/src/ic/arm/ic-conventions-arm.cc b/src/ic/arm/ic-conventions-arm.cc
index 5e22858b8077e74cfc44339cc41e6a31dd3b47a6..6192cba20a2ff423c77f20b9bfb159b2f10b6836 100644
--- a/src/ic/arm/ic-conventions-arm.cc
+++ b/src/ic/arm/ic-conventions-arm.cc
@@ -17,24 +17,20 @@ const Register LoadConvention::ReceiverRegister() { return r1; }
 const Register LoadConvention::NameRegister() { return r2; }
 
 
-const Register VectorLoadConvention::SlotRegister() {
-  DCHECK(FLAG_vector_ics);
-  return r0;
-}
+const Register VectorLoadConvention::SlotRegister() { return r0; }
 
 
-const Register FullVectorLoadConvention::VectorRegister() {
-  DCHECK(FLAG_vector_ics);
-  return r3;
-}
+const Register FullVectorLoadConvention::VectorRegister() { return r3; }
 
 
 const Register StoreConvention::ReceiverRegister() { return r1; }
 const Register StoreConvention::NameRegister() { return r2; }
 const Register StoreConvention::ValueRegister() { return r0; }
+const Register StoreConvention::MapRegister() { return r3; }
 
 
-const Register StoreConvention::MapRegister() { return r3; }
+const Register InstanceofConvention::left() { return r0; }
+const Register InstanceofConvention::right() { return r1; }
 }
 }  // namespace v8::internal