Optimize functions on a second thread.

src/handles-inl.h

 // Copyright 2006-2008 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 131 matching lines @@
   current->next = cur + 1;
 
   T** result = reinterpret_cast<T**>(cur);
   *result = value;
   return result;
 }
 
 
 #ifdef DEBUG
 inline NoHandleAllocation::NoHandleAllocation() {
+  Isolate* isolate = Isolate::Current();
   v8::ImplementationUtilities::HandleScopeData* current =
-      Isolate::Current()->handle_scope_data();
+      isolate->handle_scope_data();
 
-  // Shrink the current handle scope to make it impossible to do
-  // handle allocations without an explicit handle scope.
-  current->limit = current->next;
+  active_ = !isolate->optimizing_compiler_thread()->IsOptimizerThread();
+  if (active_) {
+    // Shrink the current handle scope to make it impossible to do
+    // handle allocations without an explicit handle scope.
+    current->limit = current->next;
 
-  level_ = current->level;
-  current->level = 0;
+    level_ = current->level;
+    current->level = 0;
+  }
 }
 
 
 inline NoHandleAllocation::~NoHandleAllocation() {
-  // Restore state in current handle scope to re-enable handle
-  // allocations.
-  v8::ImplementationUtilities::HandleScopeData* data =
-      Isolate::Current()->handle_scope_data();
-  ASSERT_EQ(0, data->level);
-  data->level = level_;
+  if (active_) {
+    // Restore state in current handle scope to re-enable handle
+    // allocations.
+    v8::ImplementationUtilities::HandleScopeData* data =
+        Isolate::Current()->handle_scope_data();
+    ASSERT_EQ(0, data->level);
+    data->level = level_;
+  }
 }
 #endif
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_HANDLES_INL_H_