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

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 2219edade6b54521181202af97c4b10beae2322d..38814fab391748e372a0feb5d6bc903ada4dcb7c 100644
--- a/src/mips64/interface-descriptors-mips64.cc
+++ b/src/mips64/interface-descriptors-mips64.cc
@@ -16,12 +16,10 @@ const Register CallInterfaceDescriptor::ContextRegister() { return cp; }
 
 const Register LoadDescriptor::ReceiverRegister() { return a1; }
 const Register LoadDescriptor::NameRegister() { return a2; }
+const Register LoadDescriptor::SlotRegister() { return a0; }
 
 
-const Register VectorLoadICTrampolineDescriptor::SlotRegister() { return a0; }
-
-
-const Register VectorLoadICDescriptor::VectorRegister() { return a3; }
+const Register LoadWithVectorDescriptor::VectorRegister() { return a3; }
 
 
 const Register StoreDescriptor::ReceiverRegister() { return a1; }