Emit mementos in crankshaft.

src/objects.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_OBJECTS_H_
 #define V8_OBJECTS_H_
 
 #include "src/allocation.h"
 #include "src/assert-scope.h"
 #include "src/builtins.h"
@@ skipping 8619 matching lines @@
     return PretenureDecisionBits::decode(value);
   }
 
   void set_pretenure_decision(PretenureDecision decision) {
     int value = pretenure_data()->value();
     set_pretenure_data(
         Smi::FromInt(PretenureDecisionBits::update(value, decision)),
         SKIP_WRITE_BARRIER);
   }
 
+  bool emit_mementos() {
+    return pretenure_decision() == kUndecided;
+  }
+
   bool deopt_dependent_code() {
     int value = pretenure_data()->value();
     return DeoptDependentCodeBit::decode(value);
   }
 
   void set_deopt_dependent_code(bool deopt) {
     int value = pretenure_data()->value();
     set_pretenure_data(
         Smi::FromInt(DeoptDependentCodeBit::update(value, deopt)),
         SKIP_WRITE_BARRIER);
@@ skipping 2594 matching lines @@
     } else {
       value &= ~(1 << bit_position);
     }
     return value;
   }
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_OBJECTS_H_