Disable the CompilerDispatcher if we don't have idle time

src/compiler-dispatcher/compiler-dispatcher.cc

Index: src/compiler-dispatcher/compiler-dispatcher.cc
diff --git a/src/compiler-dispatcher/compiler-dispatcher.cc b/src/compiler-dispatcher/compiler-dispatcher.cc
index 1b639fe9b0ad7035969b993a2253397461fa595c..5cf10aa3eb8ac012143c4f4b486d0e69c3bcfc1c 100644
--- a/src/compiler-dispatcher/compiler-dispatcher.cc
+++ b/src/compiler-dispatcher/compiler-dispatcher.cc
@@ -110,6 +110,8 @@ CompilerDispatcher::~CompilerDispatcher() {
 }
 
 bool CompilerDispatcher::Enqueue(Handle<SharedFunctionInfo> function) {
+  if (!IsEnabled()) return false;
+
   // We only handle functions (no eval / top-level code / wasm) that are
   // attached to a script.
   if (!function->script()->IsScript() || !function->is_function() ||
@@ -127,6 +129,11 @@ bool CompilerDispatcher::Enqueue(Handle<SharedFunctionInfo> function) {
   return true;
 }
 
+bool CompilerDispatcher::IsEnabled() const {
+  v8::Isolate* v8_isolate = reinterpret_cast<v8::Isolate*>(isolate_);
+  return FLAG_compiler_dispatcher && platform_->IdleTasksEnabled(v8_isolate);
+}
+
 bool CompilerDispatcher::IsEnqueued(Handle<SharedFunctionInfo> function) const {
   return GetJobFor(function) != jobs_.end();
 }
@@ -183,7 +190,7 @@ CompilerDispatcher::JobMap::const_iterator CompilerDispatcher::GetJobFor(
 
 void CompilerDispatcher::ScheduleIdleTaskIfNeeded() {
   v8::Isolate* v8_isolate = reinterpret_cast<v8::Isolate*>(isolate_);
-  if (!platform_->IdleTasksEnabled(v8_isolate)) return;
+  DCHECK(platform_->IdleTasksEnabled(v8_isolate));
   if (idle_task_scheduled_) return;
   if (jobs_.empty()) return;
   idle_task_scheduled_ = true;