Introduce FeedbackNexus for vector-based ics.

src/ic/ic-state.h

Index: src/ic/ic-state.h
diff --git a/src/ic/ic-state.h b/src/ic/ic-state.h
index a8cfefd10453466405cd8d72940d337f18bc7aa2..9bb877a3835761448072ae65ec68be73e5109d95 100644
--- a/src/ic/ic-state.h
+++ b/src/ic/ic-state.h
@@ -20,8 +20,9 @@ class ICUtility : public AllStatic {
   static void Clear(Isolate* isolate, Address address,
                     ConstantPoolArray* constant_pool);
   // Clear a vector-based inline cache to initial state.
+  template <class Nexus>
   static void Clear(Isolate* isolate, Code::Kind kind, Code* host,
-                    TypeFeedbackVector* vector, FeedbackVectorICSlot slot);
+                    Nexus* nexus);
 };