VectorICs: Remove --vector-stores flag.

src/objects.cc

Index: src/objects.cc
diff --git a/src/objects.cc b/src/objects.cc
index 9be16fb47bc869d54341ee49c2e2d71e573d1e67..cf2b2d33e7d8510eb970418704c03474fc49f832 100644
--- a/src/objects.cc
+++ b/src/objects.cc
@@ -5505,7 +5505,7 @@ void JSObject::RequireSlowElements(SeededNumberDictionary* dictionary) {
   dictionary->set_requires_slow_elements();
   // TODO(verwaest): Remove this hack.
   if (map()->is_prototype_map()) {
-    GetHeap()->ClearAllKeyedStoreICs();
+    TypeFeedbackVector::ClearAllKeyedStoreICs(GetIsolate());
   }
 }
 
@@ -14347,7 +14347,7 @@ Maybe<bool> JSObject::SetPrototypeUnobserved(Handle<JSObject> object,
     // If the prototype chain didn't previously have element callbacks, then
     // KeyedStoreICs need to be cleared to ensure any that involve this
     // map go generic.
-    object->GetHeap()->ClearAllKeyedStoreICs();
+    TypeFeedbackVector::ClearAllKeyedStoreICs(isolate);
   }
 
   heap->ClearInstanceofCache();
@@ -16799,7 +16799,7 @@ void SeededNumberDictionary::UpdateMaxNumberKey(uint32_t key,
   if (key > kRequiresSlowElementsLimit) {
     if (used_as_prototype) {
       // TODO(verwaest): Remove this hack.
-      GetHeap()->ClearAllKeyedStoreICs();
+      TypeFeedbackVector::ClearAllKeyedStoreICs(GetIsolate());
     }
     set_requires_slow_elements();
     return;