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

test/cctest/test-heap.cc

Index: test/cctest/test-heap.cc
diff --git a/test/cctest/test-heap.cc b/test/cctest/test-heap.cc
index ee476db6cdc4729b1a65a560fe03734a65f2bfdb..af81bfae332b1d0ed9aa80a33b0bb06edfa5b155 100644
--- a/test/cctest/test-heap.cc
+++ b/test/cctest/test-heap.cc
@@ -3147,20 +3147,18 @@ TEST(IncrementalMarkingClearsTypeFeedbackInfo) {
 
   Handle<TypeFeedbackVector> feedback_vector(f->shared()->feedback_vector());
 
-  int expected_length = FLAG_vector_ics ? 4 : 2;
-  CHECK_EQ(expected_length, feedback_vector->length());
-  for (int i = 0; i < expected_length; i++) {
-    if ((i % 2) == 1) {
-      CHECK(feedback_vector->get(i)->IsJSFunction());
-    }
+  int expected_slots = 2;
+  CHECK_EQ(expected_slots, feedback_vector->ICSlots());
+  for (int i = 0; i < expected_slots; i++) {
+    CHECK(feedback_vector->Get(FeedbackVectorICSlot(i))->IsJSFunction());
   }
 
   SimulateIncrementalMarking(CcTest::heap());
   CcTest::heap()->CollectAllGarbage(Heap::kNoGCFlags);
 
-  CHECK_EQ(expected_length, feedback_vector->length());
-  for (int i = 0; i < expected_length; i++) {
-    CHECK_EQ(feedback_vector->get(i),
+  CHECK_EQ(expected_slots, feedback_vector->ICSlots());
+  for (int i = 0; i < expected_slots; i++) {
+    CHECK_EQ(feedback_vector->Get(FeedbackVectorICSlot(i)),
              *TypeFeedbackVector::UninitializedSentinel(CcTest::i_isolate()));
   }
 }