Change and disable global handle zapping.

src/v8globals.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 53 matching lines @@
 const intptr_t kFailureTagMask = (1 << kFailureTagSize) - 1;
 
 
 // Zap-value: The value used for zapping dead objects.
 // Should be a recognizable hex value tagged as a failure.
 #ifdef V8_HOST_ARCH_64_BIT
 const Address kZapValue =
     reinterpret_cast<Address>(V8_UINT64_C(0xdeadbeedbeadbeef));
 const Address kHandleZapValue =
     reinterpret_cast<Address>(V8_UINT64_C(0x1baddead0baddeaf));
+const Address kGlobalHandleZapValue =
+    reinterpret_cast<Address>(V8_UINT64_C(0x1baffed00baffedf));
 const Address kFromSpaceZapValue =
     reinterpret_cast<Address>(V8_UINT64_C(0x1beefdad0beefdaf));
 const uint64_t kDebugZapValue = V8_UINT64_C(0xbadbaddbbadbaddb);
 const uint64_t kSlotsZapValue = V8_UINT64_C(0xbeefdeadbeefdeef);
 const uint64_t kFreeListZapValue = 0xfeed1eaffeed1eaf;
 #else
 const Address kZapValue = reinterpret_cast<Address>(0xdeadbeef);
 const Address kHandleZapValue = reinterpret_cast<Address>(0xbaddeaf);
+const Address kGlobalHandleZapValue = reinterpret_cast<Address>(0xbaffedf);
 const Address kFromSpaceZapValue = reinterpret_cast<Address>(0xbeefdaf);
 const uint32_t kSlotsZapValue = 0xbeefdeef;
 const uint32_t kDebugZapValue = 0xbadbaddb;
 const uint32_t kFreeListZapValue = 0xfeed1eaf;
 #endif
 
 const int kCodeZapValue = 0xbadc0de;
 
 // Number of bits to represent the page size for paged spaces. The value of 20
 // gives 1Mb bytes per page.
@@ skipping 474 matching lines @@
 
 enum ClearExceptionFlag {
   KEEP_EXCEPTION,
   CLEAR_EXCEPTION
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_V8GLOBALS_H_