[turbofan] Enable concurrent (re)compilation.

src/optimizing-compile-dispatcher.cc

Index: src/optimizing-compile-dispatcher.cc
diff --git a/src/optimizing-compile-dispatcher.cc b/src/optimizing-compile-dispatcher.cc
index 2c9365edb4d7e0347c0a5d37f599b38665af5743..22aa1757b536ed327e7fca3bbc0d1ae8e182ba32 100644
--- a/src/optimizing-compile-dispatcher.cc
+++ b/src/optimizing-compile-dispatcher.cc
@@ -23,6 +23,7 @@ void DisposeOptimizedCompileJob(OptimizedCompileJob* job,
     Handle<JSFunction> function = info->closure();
     function->ReplaceCode(function->shared()->code());
   }
+  delete job;
   delete info;
 }