[turbofan] Enable concurrent (re)compilation.

src/optimizing-compile-dispatcher.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/optimizing-compile-dispatcher.h"
 
 #include "src/base/atomicops.h"
 #include "src/full-codegen/full-codegen.h"
 #include "src/isolate.h"
 #include "src/tracing/trace-event.h"
 #include "src/v8.h"
 
 namespace v8 {
 namespace internal {
 
 namespace {
 
 void DisposeOptimizedCompileJob(OptimizedCompileJob* job,
                                 bool restore_function_code) {
   // The recompile job is allocated in the CompilationInfo's zone.
   CompilationInfo* info = job->info();
   if (restore_function_code) {
     Handle<JSFunction> function = info->closure();
     function->ReplaceCode(function->shared()->code());
   }
+  delete job;
   delete info;
 }
 
 }  // namespace
 
 
 class OptimizingCompileDispatcher::CompileTask : public v8::Task {
  public:
   explicit CompileTask(Isolate* isolate) : isolate_(isolate) {
     OptimizingCompileDispatcher* dispatcher =
@@ skipping 186 matching lines @@
   while (blocked_jobs_ > 0) {
     V8::GetCurrentPlatform()->CallOnBackgroundThread(
         new CompileTask(isolate_), v8::Platform::kShortRunningTask);
     blocked_jobs_--;
   }
 }
 
 
 }  // namespace internal
 }  // namespace v8