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

src/mips64/interface-descriptors-mips64.cc

Index: src/mips64/interface-descriptors-mips64.cc
diff --git a/src/mips64/interface-descriptors-mips64.cc b/src/mips64/interface-descriptors-mips64.cc
index f9811f92d15e33dced6605798ea06374e8eb5f19..0716744f1c0ef9a56aa518afbbfc9d9ce3a7dcd7 100644
--- a/src/mips64/interface-descriptors-mips64.cc
+++ b/src/mips64/interface-descriptors-mips64.cc
@@ -31,13 +31,9 @@ const Register LoadWithVectorDescriptor::VectorRegister() { return a3; }
 const Register StoreDescriptor::ReceiverRegister() { return a1; }
 const Register StoreDescriptor::NameRegister() { return a2; }
 const Register StoreDescriptor::ValueRegister() { return a0; }
+const Register StoreDescriptor::SlotRegister() { return a4; }
 
-
-const Register VectorStoreICTrampolineDescriptor::SlotRegister() { return a4; }
-
-
-const Register VectorStoreICDescriptor::VectorRegister() { return a3; }
-
+const Register StoreWithVectorDescriptor::VectorRegister() { return a3; }
 
 const Register VectorStoreTransitionDescriptor::SlotRegister() { return a4; }
 const Register VectorStoreTransitionDescriptor::VectorRegister() { return a3; }