Introduce FeedbackNexus for vector-based ics.

src/ic/ic-state.cc

Index: src/ic/ic-state.cc
diff --git a/src/ic/ic-state.cc b/src/ic/ic-state.cc
index 5a17bc8688c77514d1ed2865675524d31f75ba06..18ea7f310585dd5e81bed79b8ff70402e633e699 100644
--- a/src/ic/ic-state.cc
+++ b/src/ic/ic-state.cc
@@ -18,12 +18,18 @@ void ICUtility::Clear(Isolate* isolate, Address address,
 
 
 // static
+template <class Nexus>
 void ICUtility::Clear(Isolate* isolate, Code::Kind kind, Code* host,
-                      TypeFeedbackVector* vector, FeedbackVectorICSlot slot) {
-  IC::Clear(isolate, kind, host, vector, slot);
+                      Nexus* nexus) {
+  IC::Clear<Nexus>(isolate, kind, host, nexus);
 }
 
 
+// Force instantiation of template instances for vector-based IC clearing.
+template void ICUtility::Clear<CallICNexus>(Isolate*, Code::Kind, Code*,
+                                            CallICNexus*);
+
+
 CallICState::CallICState(ExtraICState extra_ic_state)
     : argc_(ArgcBits::decode(extra_ic_state)),
       call_type_(CallTypeBits::decode(extra_ic_state)) {}