Cleanup interface descriptors to reflect that vectors are part of stores.

src/s390/interface-descriptors-s390.cc

Index: src/s390/interface-descriptors-s390.cc
diff --git a/src/s390/interface-descriptors-s390.cc b/src/s390/interface-descriptors-s390.cc
index 07a90d1b066070f0106fd983294444f14766a2f4..d529d076876e3e08f075ae4f415b571293a27816 100644
--- a/src/s390/interface-descriptors-s390.cc
+++ b/src/s390/interface-descriptors-s390.cc
@@ -29,10 +29,9 @@ const Register LoadWithVectorDescriptor::VectorRegister() { return r5; }
 const Register StoreDescriptor::ReceiverRegister() { return r3; }
 const Register StoreDescriptor::NameRegister() { return r4; }
 const Register StoreDescriptor::ValueRegister() { return r2; }
+const Register StoreDescriptor::SlotRegister() { return r6; }
 
-const Register VectorStoreICTrampolineDescriptor::SlotRegister() { return r6; }
-
-const Register VectorStoreICDescriptor::VectorRegister() { return r5; }
+const Register StoreWithVectorDescriptor::VectorRegister() { return r5; }
 
 const Register VectorStoreTransitionDescriptor::SlotRegister() { return r6; }
 const Register VectorStoreTransitionDescriptor::VectorRegister() { return r5; }