Make assertion scopes thread safe.

src/ia32/macro-assembler-ia32.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 2475 matching lines @@
   // The registers are pushed starting with the lowest encoding,
   // which means that lowest encodings are furthest away from
   // the stack pointer.
   ASSERT(reg_code >= 0 && reg_code < kNumSafepointRegisters);
   return kNumSafepointRegisters - reg_code - 1;
 }
 
 
 void MacroAssembler::LoadHeapObject(Register result,
                                     Handle<HeapObject> object) {
-  ALLOW_HANDLE_DEREF(isolate(), "embedding raw address");
+  AllowDeferredHandleDereference embedding_raw_address;
   if (isolate()->heap()->InNewSpace(*object)) {
     Handle<JSGlobalPropertyCell> cell =
         isolate()->factory()->NewJSGlobalPropertyCell(object);
     mov(result, Operand::Cell(cell));
   } else {
     mov(result, object);
   }
 }
 
 
 void MacroAssembler::CmpHeapObject(Register reg, Handle<HeapObject> object) {
-  ALLOW_HANDLE_DEREF(isolate(), "using raw address");
+  AllowDeferredHandleDereference using_raw_address;
   if (isolate()->heap()->InNewSpace(*object)) {
     Handle<JSGlobalPropertyCell> cell =
         isolate()->factory()->NewJSGlobalPropertyCell(object);
     cmp(reg, Operand::Cell(cell));
   } else {
     cmp(reg, object);
   }
 }
 
 
 void MacroAssembler::PushHeapObject(Handle<HeapObject> object) {
-  ALLOW_HANDLE_DEREF(isolate(), "using raw address");
+  AllowDeferredHandleDereference using_raw_address;
   if (isolate()->heap()->InNewSpace(*object)) {
     Handle<JSGlobalPropertyCell> cell =
         isolate()->factory()->NewJSGlobalPropertyCell(object);
     push(Operand::Cell(cell));
   } else {
     Push(object);
   }
 }
 
 
@@ skipping 620 matching lines @@
   j(greater, &no_info_available);
   cmp(MemOperand(scratch_reg, -AllocationSiteInfo::kSize),
       Immediate(Handle<Map>(isolate()->heap()->allocation_site_info_map())));
   bind(&no_info_available);
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_IA32