VectorICs: refactoring to eliminate "for queries only" vector ic mode.

src/ic/x64/ic-x64.cc

Index: src/ic/x64/ic-x64.cc
diff --git a/src/ic/x64/ic-x64.cc b/src/ic/x64/ic-x64.cc
index b987c9362db2feb4729b13af786cae8e4512b2fb..2b94562f6434bd9254ebdf50534587e8e1b8a0d7 100644
--- a/src/ic/x64/ic-x64.cc
+++ b/src/ic/x64/ic-x64.cc
@@ -345,9 +345,10 @@ void KeyedLoadIC::GenerateMegamorphic(MacroAssembler* masm,
   Register vector = LoadWithVectorDescriptor::VectorRegister();
   Register slot = LoadDescriptor::SlotRegister();
   DCHECK(!AreAliased(megamorphic_scratch, vector, slot));
-  Handle<TypeFeedbackVector> dummy_vector = Handle<TypeFeedbackVector>::cast(
-      masm->isolate()->factory()->keyed_load_dummy_vector());
-  int slot_index = dummy_vector->GetIndex(FeedbackVectorICSlot(0));
+  Handle<TypeFeedbackVector> dummy_vector =
+      TypeFeedbackVector::DummyVector(masm->isolate());
+  int slot_index = dummy_vector->GetIndex(
+      FeedbackVectorICSlot(TypeFeedbackVector::kDummyKeyedLoadICSlot));
   __ Move(vector, dummy_vector);
   __ Move(slot, Smi::FromInt(slot_index));
 
@@ -572,9 +573,10 @@ void KeyedStoreIC::GenerateMegamorphic(MacroAssembler* masm,
     Register slot = VectorStoreICDescriptor::SlotRegister();
     // The handlers in the stub cache expect a vector and slot. Since we won't
     // change the IC from any downstream misses, a dummy vector can be used.
-    Handle<TypeFeedbackVector> dummy_vector = Handle<TypeFeedbackVector>::cast(
-        masm->isolate()->factory()->keyed_store_dummy_vector());
-    int slot_index = dummy_vector->GetIndex(FeedbackVectorICSlot(0));
+    Handle<TypeFeedbackVector> dummy_vector =
+        TypeFeedbackVector::DummyVector(masm->isolate());
+    int slot_index = dummy_vector->GetIndex(
+        FeedbackVectorICSlot(TypeFeedbackVector::kDummyKeyedStoreICSlot));
     __ Move(vector, dummy_vector);
     __ Move(slot, Smi::FromInt(slot_index));
   }