Disable concurrent osr when concurrent recompilation is disabled.

src/optimizing-compiler-thread.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 328 matching lines @@
       return !current->IsWaitingForInstall();
     }
   }
   return false;
 }
 
 
 void OptimizingCompilerThread::AddToOsrBuffer(RecompileJob* job) {
   ASSERT(!IsOptimizerThread());
   // Find the next slot that is empty or has a stale job.
+  RecompileJob* stale = NULL;
   while (true) {
-    RecompileJob* stale = osr_buffer_[osr_buffer_cursor_];
+    stale = osr_buffer_[osr_buffer_cursor_];
     if (stale == NULL || stale->IsWaitingForInstall()) break;
     osr_buffer_cursor_ = (osr_buffer_cursor_ + 1) % osr_buffer_capacity_;
   }
 
   // Add to found slot and dispose the evicted job.
-  RecompileJob* evicted = osr_buffer_[osr_buffer_cursor_];
-  if (evicted != NULL) {
-    ASSERT(evicted->IsWaitingForInstall());
-    CompilationInfo* info = evicted->info();
+  if (stale != NULL) {
+    ASSERT(stale->IsWaitingForInstall());
+    CompilationInfo* info = stale->info();
     if (FLAG_trace_osr) {
       PrintF("[COSR - Discarded ");
       info->closure()->PrintName();
       PrintF(", AST id %d]\n", info->osr_ast_id().ToInt());
     }
-    DisposeRecompileJob(evicted, false);
+    DisposeRecompileJob(stale, false);
   }
   osr_buffer_[osr_buffer_cursor_] = job;
   osr_buffer_cursor_ = (osr_buffer_cursor_ + 1) % osr_buffer_capacity_;
 }
 
 
 #ifdef DEBUG
 bool OptimizingCompilerThread::IsOptimizerThread() {
   if (!FLAG_concurrent_recompilation) return false;
   LockGuard<Mutex> lock_guard(&thread_id_mutex_);
   return ThreadId::Current().ToInteger() == thread_id_;
 }
 #endif
 
 
 } }  // namespace v8::internal