WIP: type profiling.

src/ast/ast.cc

Index: src/ast/ast.cc
diff --git a/src/ast/ast.cc b/src/ast/ast.cc
index 51afdac51e5ca06be4d339bc5522921fdd64b51a..67bfe994e7529fd6542773550b656362412f6590 100644
--- a/src/ast/ast.cc
+++ b/src/ast/ast.cc
@@ -282,6 +282,9 @@ void Assignment::AssignFeedbackSlots(FeedbackVectorSpec* spec,
                                      LanguageMode language_mode,
                                      FeedbackSlotCache* cache) {
   AssignVectorSlots(target(), spec, language_mode, &slot_);
+  if (FLAG_type_profile) {
+    collect_type_profile_slot_ = spec->AddTypeProfileSlot();
+  }
 }
 
 void CountOperation::AssignFeedbackSlots(FeedbackVectorSpec* spec,