VectorICs: Remove --vector-stores flag.

src/crankshaft/hydrogen-instructions.h

Index: src/crankshaft/hydrogen-instructions.h
diff --git a/src/crankshaft/hydrogen-instructions.h b/src/crankshaft/hydrogen-instructions.h
index 9bb418c5a63a5c97f770a20e69a1a114b0e948df..bff95a8fc18d69240a36922977324c6b9091f39a 100644
--- a/src/crankshaft/hydrogen-instructions.h
+++ b/src/crankshaft/hydrogen-instructions.h
@@ -6954,7 +6954,7 @@ class HStoreNamedGeneric final : public HTemplateInstruction<3> {
   Handle<TypeFeedbackVector> feedback_vector() const {
     return feedback_vector_;
   }
-  bool HasVectorAndSlot() const { return FLAG_vector_stores; }
+  bool HasVectorAndSlot() const { return true; }
   void SetVectorAndSlot(Handle<TypeFeedbackVector> vector,
                         FeedbackVectorSlot slot) {
     feedback_vector_ = vector;
@@ -7180,8 +7180,6 @@ class HStoreKeyedGeneric final : public HTemplateInstruction<4> {
     return feedback_vector_;
   }
   bool HasVectorAndSlot() const {
-    DCHECK(!(FLAG_vector_stores && initialization_state_ != MEGAMORPHIC) ||
-           !feedback_vector_.is_null());
     return !feedback_vector_.is_null();
   }
   void SetVectorAndSlot(Handle<TypeFeedbackVector> vector,