[TypeFeedbackVector] special ic slots for interpreter compare/binary ops.

src/code-stub-assembler.cc

Index: src/code-stub-assembler.cc
diff --git a/src/code-stub-assembler.cc b/src/code-stub-assembler.cc
index a8489d2a98a1b20dce0bbd8961ef073bfb425830..10ab67aef5397a9e1e09b978671b28ed292748b7 100644
--- a/src/code-stub-assembler.cc
+++ b/src/code-stub-assembler.cc
@@ -3582,30 +3582,15 @@ void CodeStubAssembler::UpdateFeedback(compiler::Node* feedback,
                                        compiler::Node* slot_id) {
   Label combine_feedback(this), record_feedback(this), end(this);
 
+  // This method is used for binary op and compare feedback. These
+  // vector nodes are initialized with a smi 0, so we can simply OR
+  // our new feedback in place.
   Node* previous_feedback =
       LoadFixedArrayElement(type_feedback_vector, slot_id);
-  Node* is_uninitialized = WordEqual(
-      previous_feedback,
-      HeapConstant(TypeFeedbackVector::UninitializedSentinel(isolate())));
-  BranchIf(is_uninitialized, &record_feedback, &combine_feedback);
-
-  Bind(&record_feedback);
-  {
-    StoreFixedArrayElement(type_feedback_vector, slot_id, SmiTag(feedback),
-                           SKIP_WRITE_BARRIER);
-    Goto(&end);
-  }
-
-  Bind(&combine_feedback);
-  {
-    Node* untagged_previous_feedback = SmiUntag(previous_feedback);
-    Node* combined_feedback = Word32Or(untagged_previous_feedback, feedback);
-    StoreFixedArrayElement(type_feedback_vector, slot_id,
-                           SmiTag(combined_feedback), SKIP_WRITE_BARRIER);
-    Goto(&end);
-  }
-
-  Bind(&end);
+  Node* untagged_previous_feedback = SmiUntag(previous_feedback);
+  Node* combined_feedback = Word32Or(untagged_previous_feedback, feedback);
+  StoreFixedArrayElement(type_feedback_vector, slot_id,
+                         SmiTag(combined_feedback), SKIP_WRITE_BARRIER);
 }
 
 compiler::Node* CodeStubAssembler::LoadReceiverMap(compiler::Node* receiver) {