Remove support for specifying the number of available threads

src/optimizing-compile-dispatcher.h

Index: src/optimizing-compile-dispatcher.h
diff --git a/src/optimizing-compile-dispatcher.h b/src/optimizing-compile-dispatcher.h
index 822bb40b317ee753dc30619d236fbc54190b9f23..ad09dfa734be336e791aef8f6360dbe642f3439a 100644
--- a/src/optimizing-compile-dispatcher.h
+++ b/src/optimizing-compile-dispatcher.h
@@ -70,9 +70,7 @@ class OptimizingCompileDispatcher {
     AddToOsrBuffer(NULL);
   }
 
-  static bool Enabled(int max_available) {
-    return (FLAG_concurrent_recompilation && max_available > 1);
-  }
+  static bool Enabled() { return FLAG_concurrent_recompilation; }
 
  private:
   class CompileTask;