Make assertion scopes thread safe.

src/mips/assembler-mips.cc

 // Copyright (c) 1994-2006 Sun Microsystems Inc.
 // 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.
 //
@@ skipping 222 matching lines @@
 
 
 // -----------------------------------------------------------------------------
 // Implementation of Operand and MemOperand.
 // See assembler-mips-inl.h for inlined constructors.
 
 Operand::Operand(Handle<Object> handle) {
 #ifdef DEBUG
   Isolate* isolate = Isolate::Current();
 #endif
-  ALLOW_HANDLE_DEREF(isolate, "using and embedding raw address");
+  AllowDeferredHandleDereference using_raw_address;
   rm_ = no_reg;
   // Verify all Objects referred by code are NOT in new space.
   Object* obj = *handle;
   ASSERT(!isolate->heap()->InNewSpace(obj));
   if (obj->IsHeapObject()) {
     imm32_ = reinterpret_cast<intptr_t>(handle.location());
     rmode_ = RelocInfo::EMBEDDED_OBJECT;
   } else {
     // No relocation needed.
     imm32_ = reinterpret_cast<intptr_t>(obj);
@@ skipping 2032 matching lines @@
   }
 
   if (patched) {
       CPU::FlushICache(pc+2, sizeof(Address));
   }
 }
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_MIPS