Deopt marked code at safe deoptimization point when pretenuring.

src/execution.h

Index: src/execution.h
diff --git a/src/execution.h b/src/execution.h
index 3e62d8730ab471bc71f9d0ce5dc603be0356854e..abf4f1dc654bdcd38fd0ef61b3237931c6b07afa 100644
--- a/src/execution.h
+++ b/src/execution.h
@@ -44,7 +44,8 @@ enum InterruptFlag {
   GC_REQUEST = 1 << 5,
   FULL_DEOPT = 1 << 6,
   INSTALL_CODE = 1 << 7,
-  API_INTERRUPT = 1 << 8
+  API_INTERRUPT = 1 << 8,
+  DEOPT_MARKED_CODE = 1 << 9
 };
 
 
@@ -221,6 +222,8 @@ class StackGuard {
   void RequestInstallCode();
   bool IsFullDeopt();
   void FullDeopt();
+  bool IsDeoptMarkedCode();
+  void DeoptMarkedCode();
   void Continue(InterruptFlag after_what);
 
   void RequestInterrupt(InterruptCallback callback, void* data);