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

src/arm64/interface-descriptors-arm64.cc

Index: src/arm64/interface-descriptors-arm64.cc
diff --git a/src/arm64/interface-descriptors-arm64.cc b/src/arm64/interface-descriptors-arm64.cc
index d8f24a01ef5db384a477450afcc062b12a98b9c5..390260e83538555da0ccf4cc856cb22e26acb0c3 100644
--- a/src/arm64/interface-descriptors-arm64.cc
+++ b/src/arm64/interface-descriptors-arm64.cc
@@ -16,12 +16,10 @@ const Register CallInterfaceDescriptor::ContextRegister() { return cp; }
 
 const Register LoadDescriptor::ReceiverRegister() { return x1; }
 const Register LoadDescriptor::NameRegister() { return x2; }
+const Register LoadDescriptor::SlotRegister() { return x0; }
 
 
-const Register VectorLoadICTrampolineDescriptor::SlotRegister() { return x0; }
-
-
-const Register VectorLoadICDescriptor::VectorRegister() { return x3; }
+const Register LoadWithVectorDescriptor::VectorRegister() { return x3; }
 
 
 const Register StoreDescriptor::ReceiverRegister() { return x1; }