[turbofan] Also disable concurrent recompilation when tracing TurboFan.

Treat --trace-turbo and --trace-turbo-graph similar to --trace-hydrogen
and --trace-hydrogen-stubs, in that we disable concurrent recompilation
in that case (otherwise we cannot print heap objects and stuff).

R=ishell@chromium.org
BUG=v8:4969
LOG=n

Review-Url: https://codereview.chromium.org/1965653003
Cr-Commit-Position: refs/heads/master@{#36123}

src/isolate.cc

@@ -2293,7 +2293,8 @@ bool Isolate::Init(Deserializer* des) {
     set_event_logger(Logger::DefaultEventLoggerSentinel);
   }
 
-  if (FLAG_trace_hydrogen || FLAG_trace_hydrogen_stubs) {
+  if (FLAG_trace_hydrogen || FLAG_trace_hydrogen_stubs || FLAG_trace_turbo ||
+      FLAG_trace_turbo_graph) {
     PrintF("Concurrent recompilation has been disabled for tracing.\n");
   } else if (OptimizingCompileDispatcher::Enabled()) {
     optimizing_compile_dispatcher_ = new OptimizingCompileDispatcher(this);