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

src/x64/interface-descriptors-x64.cc

Index: src/x64/interface-descriptors-x64.cc
diff --git a/src/x64/interface-descriptors-x64.cc b/src/x64/interface-descriptors-x64.cc
index 46c049181a2b06f444e9b78cd88a607e5e5b8e2c..08edaac0109a941d57ad98732f8c668c0ff18093 100644
--- a/src/x64/interface-descriptors-x64.cc
+++ b/src/x64/interface-descriptors-x64.cc
@@ -16,12 +16,10 @@ const Register CallInterfaceDescriptor::ContextRegister() { return rsi; }
 
 const Register LoadDescriptor::ReceiverRegister() { return rdx; }
 const Register LoadDescriptor::NameRegister() { return rcx; }
+const Register LoadDescriptor::SlotRegister() { return rax; }
 
 
-const Register VectorLoadICTrampolineDescriptor::SlotRegister() { return rax; }
-
-
-const Register VectorLoadICDescriptor::VectorRegister() { return rbx; }
+const Register LoadWithVectorDescriptor::VectorRegister() { return rbx; }
 
 
 const Register StoreDescriptor::ReceiverRegister() { return rdx; }