Make assertion scopes thread safe.

src/x64/assembler-x64.cc

 // 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 1572 matching lines @@
   } else {
     ASSERT(src->is_unused());
     int32_t current = pc_offset();
     emitl(current);
     src->link_to(current);
   }
 }
 
 
 void Assembler::movq(Register dst, Handle<Object> value, RelocInfo::Mode mode) {
-  ALLOW_HANDLE_DEREF(isolate(), "using and embedding raw address");
+  AllowDeferredHandleDereference using_raw_address;
   // If there is no relocation info, emit the value of the handle efficiently
   // (possibly using less that 8 bytes for the value).
   if (RelocInfo::IsNone(mode)) {
     // There is no possible reason to store a heap pointer without relocation
     // info, so it must be a smi.
     ASSERT(value->IsSmi());
     movq(dst, reinterpret_cast<int64_t>(*value), RelocInfo::NONE64);
   } else {
     EnsureSpace ensure_space(this);
     ASSERT(value->IsHeapObject());
@@ skipping 1502 matching lines @@
 bool RelocInfo::IsCodedSpecially() {
   // The deserializer needs to know whether a pointer is specially coded.  Being
   // specially coded on x64 means that it is a relative 32 bit address, as used
   // by branch instructions.
   return (1 << rmode_) & kApplyMask;
 }
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64