Age inline caches after context disposal.

src/objects.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 4156 matching lines @@
 
   // [type_feedback_info]: Struct containing type feedback information.
   // Will contain either a TypeFeedbackInfo object, or undefined.
   DECL_ACCESSORS(type_feedback_info, Object)
 
   // [gc_metadata]: Field used to hold GC related metadata. The contents of this
   // field does not have to be traced during garbage collection since
   // it is only used by the garbage collector itself.
   DECL_ACCESSORS(gc_metadata, Object)
 
+  // [ic_age]: Inline caching age: the value of the Heap::global_ic_age
+  // at the moment when this object was created.
+  inline void set_ic_age(int count);
+  inline int ic_age();
+
   // Unchecked accessors to be used during GC.
   inline ByteArray* unchecked_relocation_info();
   inline FixedArray* unchecked_deoptimization_data();
 
   inline int relocation_size();
 
   // [flags]: Various code flags.
   inline Flags flags();
   inline void set_flags(Flags flags);
 
@@ skipping 232 matching lines @@
 
   // Layout description.
   static const int kInstructionSizeOffset = HeapObject::kHeaderSize;
   static const int kRelocationInfoOffset = kInstructionSizeOffset + kIntSize;
   static const int kHandlerTableOffset = kRelocationInfoOffset + kPointerSize;
   static const int kDeoptimizationDataOffset =
       kHandlerTableOffset + kPointerSize;
   static const int kTypeFeedbackInfoOffset =
       kDeoptimizationDataOffset + kPointerSize;
   static const int kGCMetadataOffset = kTypeFeedbackInfoOffset + kPointerSize;
-  static const int kFlagsOffset = kGCMetadataOffset + kPointerSize;
-
+  static const int kICAgeOffset =
+      kGCMetadataOffset + kPointerSize;
+  static const int kFlagsOffset = kICAgeOffset + kIntSize;
   static const int kKindSpecificFlagsOffset = kFlagsOffset + kIntSize;
   static const int kKindSpecificFlagsSize = 2 * kIntSize;
 
   static const int kHeaderPaddingStart = kKindSpecificFlagsOffset +
       kKindSpecificFlagsSize;
 
   // Add padding to align the instruction start following right after
   // the Code object header.
   static const int kHeaderSize =
       (kHeaderPaddingStart + kCodeAlignmentMask) & ~kCodeAlignmentMask;
@@ skipping 4138 matching lines @@
     } else {
       value &= ~(1 << bit_position);
     }
     return value;
   }
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_OBJECTS_H_