Track allocation info

src/ast.h

Index: src/ast.h
diff --git a/src/ast.h b/src/ast.h
index 802ac65962501dfa47db0f43f4e4de95c984a145..9339870aac258541e0f96dac59e1087ad4eae6b2 100644
--- a/src/ast.h
+++ b/src/ast.h
@@ -1575,7 +1575,8 @@ class CallNew: public Expression {
   Handle<JSFunction> target() { return target_; }
 
   BailoutId ReturnId() const { return return_id_; }
-
+  ElementsKind elements_kind() const { return elements_kind_; }
+  
  protected:
   CallNew(Isolate* isolate,
           Expression* expression,
@@ -1586,7 +1587,8 @@ class CallNew: public Expression {
         arguments_(arguments),
         pos_(pos),
         is_monomorphic_(false),
-        return_id_(GetNextId(isolate)) { }
+        return_id_(GetNextId(isolate)),
+        elements_kind_(GetInitialFastElementsKind()) { }
 
  private:
   Expression* expression_;
@@ -1597,6 +1599,7 @@ class CallNew: public Expression {
   Handle<JSFunction> target_;
 
   const BailoutId return_id_;
+  ElementsKind elements_kind_;
 };