[ic] Extract load IC proto array handlers handling to a separate stub.

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 24fc92852a9054f404b6c6d332b6a01d0b1c6087..3ee4412c10e6a1fbfa2914068743eef69c9454f3 100644
--- a/src/x64/interface-descriptors-x64.cc
+++ b/src/x64/interface-descriptors-x64.cc
@@ -29,9 +29,9 @@ const Register LoadDescriptor::ReceiverRegister() { return rdx; }
 const Register LoadDescriptor::NameRegister() { return rcx; }
 const Register LoadDescriptor::SlotRegister() { return rax; }
 
-
 const Register LoadWithVectorDescriptor::VectorRegister() { return rbx; }
 
+const Register LoadICProtoArrayDescriptor::HandlerRegister() { return rdi; }
 
 const Register StoreDescriptor::ReceiverRegister() { return rdx; }
 const Register StoreDescriptor::NameRegister() { return rcx; }