Make assertion scopes thread safe.

src/ia32/assembler-ia32-inl.h

 // 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 315 matching lines @@
 Immediate::Immediate(Label* internal_offset) {
   x_ = reinterpret_cast<int32_t>(internal_offset);
   rmode_ = RelocInfo::INTERNAL_REFERENCE;
 }
 
 
 Immediate::Immediate(Handle<Object> handle) {
 #ifdef DEBUG
   Isolate* isolate = Isolate::Current();
 #endif
-  ALLOW_HANDLE_DEREF(isolate,
-                     "using and embedding raw address, heap object check");
+  AllowDeferredHandleDereference using_raw_address;
   // Verify all Objects referred by code are NOT in new space.
   Object* obj = *handle;
   ASSERT(!isolate->heap()->InNewSpace(obj));
   if (obj->IsHeapObject()) {
     x_ = reinterpret_cast<intptr_t>(handle.location());
     rmode_ = RelocInfo::EMBEDDED_OBJECT;
   } else {
     // no relocation needed
     x_ =  reinterpret_cast<intptr_t>(obj);
     rmode_ = RelocInfo::NONE32;
@@ skipping 13 matching lines @@
 }
 
 
 void Assembler::emit(uint32_t x) {
   *reinterpret_cast<uint32_t*>(pc_) = x;
   pc_ += sizeof(uint32_t);
 }
 
 
 void Assembler::emit(Handle<Object> handle) {
-  ALLOW_HANDLE_DEREF(isolate(), "heap object check");
+  AllowDeferredHandleDereference heap_object_check;
   // Verify all Objects referred by code are NOT in new space.
   Object* obj = *handle;
   ASSERT(!isolate()->heap()->InNewSpace(obj));
   if (obj->IsHeapObject()) {
     emit(reinterpret_cast<intptr_t>(handle.location()),
          RelocInfo::EMBEDDED_OBJECT);
   } else {
     // no relocation needed
     emit(reinterpret_cast<intptr_t>(obj));
   }
 }
 
 
 void Assembler::emit(uint32_t x, RelocInfo::Mode rmode, TypeFeedbackId id) {
   if (rmode == RelocInfo::CODE_TARGET && !id.IsNone()) {
     RecordRelocInfo(RelocInfo::CODE_TARGET_WITH_ID, id.ToInt());
   } else if (!RelocInfo::IsNone(rmode)) {
     RecordRelocInfo(rmode);
   }
   emit(x);
 }
 
 
 void Assembler::emit(Handle<Code> code,
                      RelocInfo::Mode rmode,
                      TypeFeedbackId id) {
-  ALLOW_HANDLE_DEREF(isolate(), "embedding raw address");
+  AllowDeferredHandleDereference embedding_raw_address;
   emit(reinterpret_cast<intptr_t>(code.location()), rmode, id);
 }
 
 
 void Assembler::emit(const Immediate& x) {
   if (x.rmode_ == RelocInfo::INTERNAL_REFERENCE) {
     Label* label = reinterpret_cast<Label*>(x.x_);
     emit_code_relative_offset(label);
     return;
   }
@@ skipping 112 matching lines @@
 
 Operand::Operand(int32_t disp, RelocInfo::Mode rmode) {
   // [disp/r]
   set_modrm(0, ebp);
   set_dispr(disp, rmode);
 }
 
 } }  // namespace v8::internal
 
 #endif  // V8_IA32_ASSEMBLER_IA32_INL_H_