vector-based ICs did not update type feedback counts correctly.

src/objects.cc

Index: src/objects.cc
diff --git a/src/objects.cc b/src/objects.cc
index 930342d20b25fffe5e28376bf39f34822bc683d0..e94c5774fc1c6f9ebede647cf5dab2a35965e991 100644
--- a/src/objects.cc
+++ b/src/objects.cc
@@ -10493,27 +10493,7 @@ void Code::ClearInlineCaches(Code::Kind* kind) {
 
 
 void SharedFunctionInfo::ClearTypeFeedbackInfo() {
-  TypeFeedbackVector* vector = feedback_vector();
-  Heap* heap = GetHeap();
-  int length = vector->length();
-
-  for (int i = 0; i < length; i++) {
-    Object* obj = vector->get(i);
-    if (obj->IsHeapObject()) {
-      InstanceType instance_type =
-          HeapObject::cast(obj)->map()->instance_type();
-      switch (instance_type) {
-        case ALLOCATION_SITE_TYPE:
-          // AllocationSites are not cleared because they do not store
-          // information that leaks.
-          break;
-          // Fall through...
-        default:
-          vector->set(i, TypeFeedbackVector::RawUninitializedSentinel(heap),
-                      SKIP_WRITE_BARRIER);
-      }
-    }
-  }
+  feedback_vector()->ClearSlots(this);
 }