Flesh out vector ic state query and set mechanisms.

src/ic/ic-inl.h

Index: src/ic/ic-inl.h
diff --git a/src/ic/ic-inl.h b/src/ic/ic-inl.h
index 22f66d0409b03d45ce443c95caf897d4cb5d8628..15e9851dcad87f5415d1401e561aa05f411ce567 100644
--- a/src/ic/ic-inl.h
+++ b/src/ic/ic-inl.h
@@ -96,6 +96,12 @@ Code* IC::GetTargetAtAddress(Address address,
 void IC::SetTargetAtAddress(Address address, Code* target,
                             ConstantPoolArray* constant_pool) {
   DCHECK(target->is_inline_cache_stub() || target->is_compare_ic_stub());
+
+  // Don't use this for load_ics when --vector-ics is turned on.
+  DCHECK(!(FLAG_vector_ics && target->is_inline_cache_stub()) ||
+         (target->kind() != Code::LOAD_IC &&
+          target->kind() != Code::KEYED_LOAD_IC));
+
   Heap* heap = target->GetHeap();
   Code* old_target = GetTargetAtAddress(address, constant_pool);
 #ifdef DEBUG