Reland "Prevent liveedit on or under generators with open activations"

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 "allocation.h"
 #include "assert-scope.h"
 #include "builtins.h"
@@ skipping 7442 matching lines @@
   // [receiver]: The receiver of the suspended computation.
   DECL_ACCESSORS(receiver, Object)
 
   // [continuation]: Offset into code of continuation.
   //
   // A positive offset indicates a suspended generator.  The special
   // kGeneratorExecuting and kGeneratorClosed values indicate that a generator
   // cannot be resumed.
   inline int continuation();
   inline void set_continuation(int continuation);
+  inline bool is_closed();
+  inline bool is_executing();
   inline bool is_suspended();
 
   // [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);
 
@@ skipping 3646 matching lines @@
     } else {
       value &= ~(1 << bit_position);
     }
     return value;
   }
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_OBJECTS_H_