v8:3539 - hold constructor feedback in weak cells

src/type-feedback-vector.h

Index: src/type-feedback-vector.h
diff --git a/src/type-feedback-vector.h b/src/type-feedback-vector.h
index c26a2d3e0d5670e4d92a71208e41993ff107e8ad..4ba90d8cf76824814ade088a160feddd4f69760d 100644
--- a/src/type-feedback-vector.h
+++ b/src/type-feedback-vector.h
@@ -195,7 +195,11 @@ class TypeFeedbackVector : public FixedArray {
                                          Handle<TypeFeedbackVector> vector);
 
   // Clears the vector slots and the vector ic slots.
-  void ClearSlots(SharedFunctionInfo* shared);
+  void ClearSlots(SharedFunctionInfo* shared) { ClearSlotsImpl(shared, true); }
+  void ClearSlotsAtGCTime(SharedFunctionInfo* shared) {
+    ClearSlotsImpl(shared, false);
+  }
+
   void ClearICSlots(SharedFunctionInfo* shared) {
     ClearICSlotsImpl(shared, true);
   }
@@ -237,6 +241,7 @@ class TypeFeedbackVector : public FixedArray {
   typedef BitSetComputer<VectorICKind, kVectorICKindBits, kSmiValueSize,
                          uint32_t> VectorICComputer;
 
+  void ClearSlotsImpl(SharedFunctionInfo* shared, bool force_clear);
   void ClearICSlotsImpl(SharedFunctionInfo* shared, bool force_clear);
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(TypeFeedbackVector);