Make assertion scopes thread safe.

src/x64/deoptimizer-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 32 matching lines @@
 
 int Deoptimizer::patch_size() {
   return Assembler::kCallInstructionLength;
 }
 
 
 void Deoptimizer::DeoptimizeFunctionWithPreparedFunctionList(
     JSFunction* function) {
   Isolate* isolate = function->GetIsolate();
   HandleScope scope(isolate);
-  AssertNoAllocation no_allocation;
+  DisallowHeapAllocation nha;
 
   ASSERT(function->IsOptimized());
   ASSERT(function->FunctionsInFunctionListShareSameCode());
 
   // Get the optimized code.
   Code* code = function->code();
 
   // The optimized code is going to be patched, so we cannot use it any more.
   function->shared()->EvictFromOptimizedCodeMap(code, "deoptimized function");
 
@@ skipping 554 matching lines @@
   }
   __ bind(&done);
 }
 
 #undef __
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64