Generators save and restore stack handlers

src/objects.h

Index: src/objects.h
diff --git a/src/objects.h b/src/objects.h
index ca7c6a97145c25291eda93bf88ed0ae234f317cc..8978261c7212793a8ac9f1ca83e1c9be6df8c1b1 100644
--- a/src/objects.h
+++ b/src/objects.h
@@ -6396,9 +6396,14 @@ class JSGeneratorObject: public JSObject {
   inline int continuation();
   inline void set_continuation(int continuation);
 
-  // [operands]: Saved operand stack.
+  // [operand_stack]: Saved operand stack.
   DECL_ACCESSORS(operand_stack, FixedArray)
 
+  // [stack_handler_index]: Index of first stack handler in operand_stack, or -1
+  // if the captured activation had no stack handler.
+  inline int stack_handler_index();
+  inline void set_stack_handler_index(int stack_handler_index);
+
   // Casting.
   static inline JSGeneratorObject* cast(Object* obj);
 
@@ -6416,7 +6421,9 @@ class JSGeneratorObject: public JSObject {
   static const int kReceiverOffset = kContextOffset + kPointerSize;
   static const int kContinuationOffset = kReceiverOffset + kPointerSize;
   static const int kOperandStackOffset = kContinuationOffset + kPointerSize;
-  static const int kSize = kOperandStackOffset + kPointerSize;
+  static const int kStackHandlerIndexOffset =
+      kOperandStackOffset + kPointerSize;
+  static const int kSize = kStackHandlerIndexOffset + kPointerSize;
 
   // Resume mode, for use by runtime functions.
   enum ResumeMode { SEND, THROW };