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 5b98e3165447f69f292b898139d85d8ab5161b6c..8c2d98a1c8c951acb832503a4d943ef05ab3a78d 100644
--- a/src/ast/ast.cc
+++ b/src/ast/ast.cc
@@ -283,8 +283,13 @@ Assignment::Assignment(Token::Value op, Expression* target, Expression* value,
 
 void Assignment::AssignFeedbackSlots(FeedbackVectorSpec* spec,
                                      LanguageMode language_mode,
-                                     FeedbackSlotCache* cache) {
+                                     FeedbackSlotCache* cache,
+                                     bool collect_type_profile) {
   AssignVectorSlots(target(), spec, language_mode, &slot_);
+
+  if (collect_type_profile) {
+    type_profile_slot_ = spec->AddTypeProfileSlot();
+  }
 }
 
 void CountOperation::AssignFeedbackSlots(FeedbackVectorSpec* spec,