Add a flag for printf debugging the compiler dispatcher

src/compiler-dispatcher/compiler-dispatcher.h

Index: src/compiler-dispatcher/compiler-dispatcher.h
diff --git a/src/compiler-dispatcher/compiler-dispatcher.h b/src/compiler-dispatcher/compiler-dispatcher.h
index 38dd5976b38be05b4bec75716a69400f5c68b722..9e27439f242955106e419e97430cdbcb0303d2ec 100644
--- a/src/compiler-dispatcher/compiler-dispatcher.h
+++ b/src/compiler-dispatcher/compiler-dispatcher.h
@@ -120,6 +120,10 @@ class V8_EXPORT_PRIVATE CompilerDispatcher {
   Isolate* isolate_;
   Platform* platform_;
   size_t max_stack_size_;
+
+  // Copy of FLAG_trace_compiler_dispatcher to allow for access from any thread.
+  bool trace_compiler_dispatcher_;
+
   std::unique_ptr<CompilerDispatcherTracer> tracer_;
 
   std::unique_ptr<CancelableTaskManager> task_manager_;