Collect type profile for DevTools.

src/ast/ast.cc

Index: src/ast/ast.cc
diff --git a/src/ast/ast.cc b/src/ast/ast.cc
index c5e9b68960d157ee6226896224049106cde9aca5..d5ef3c1b3415d54dbd49232cbe1964e9243b1e24 100644
--- a/src/ast/ast.cc
+++ b/src/ast/ast.cc
@@ -253,7 +253,6 @@ static void AssignVectorSlots(Expression* expr, FeedbackVectorSpec* spec,
     // TODO(ishell): consider using ICSlotCache for variables here.
     if (assign_type == KEYED_PROPERTY) {
       *out_slot = spec->AddKeyedStoreICSlot(language_mode);
-
     } else {
       *out_slot = spec->AddStoreICSlot(language_mode);
     }
@@ -282,6 +281,9 @@ void Assignment::AssignFeedbackSlots(FeedbackVectorSpec* spec,
                                      LanguageMode language_mode,
                                      FeedbackSlotCache* cache) {
   AssignVectorSlots(target(), spec, language_mode, &slot_);
+  if (true || FLAG_type_profile) {
+    collect_type_profile_slot_ = spec->AddTypeProfileSlot();
+  }
 }
 
 void CountOperation::AssignFeedbackSlots(FeedbackVectorSpec* spec,