[d8] Fix tsan bugs

src/d8.h

Index: src/d8.h
diff --git a/src/d8.h b/src/d8.h
index 4e217640af1b13c63d6470ec497daaa9ae1c6887..c7a43db059e4ce33a8f8b56276161678e3ccbe60 100644
--- a/src/d8.h
+++ b/src/d8.h
@@ -293,9 +293,7 @@ class Worker {
 class ShellOptions {
  public:
   ShellOptions()
-      : script_executed(false),
-        last_run(true),
-        send_idle_notification(false),
+      : send_idle_notification(false),
         invoke_weak_callbacks(false),
         omit_quit(false),
         stress_opt(false),
@@ -310,18 +308,30 @@ class ShellOptions {
         isolate_sources(NULL),
         icu_data_file(NULL),
         natives_blob(NULL),
-        snapshot_blob(NULL) {}
+        snapshot_blob(NULL),
+        script_executed_(false),
+        last_run_(true) {}
 
   ~ShellOptions() {
     delete[] isolate_sources;
   }
 
   bool use_interactive_shell() {
-    return (interactive_shell || !script_executed) && !test_shell;
+    return (interactive_shell || !script_executed()) && !test_shell;
+  }
+
+  bool script_executed() { return base::NoBarrier_Load(&script_executed_); }
+
+  void set_script_executed(bool value) {
+    return base::NoBarrier_Store(&script_executed_, value);
+  }
+
+  bool last_run() { return base::NoBarrier_Load(&last_run_); }
+
+  void set_last_run(bool value) {
+    return base::NoBarrier_Store(&last_run_, value);
   }
 
-  bool script_executed;
-  bool last_run;
   bool send_idle_notification;
   bool invoke_weak_callbacks;
   bool omit_quit;
@@ -338,6 +348,10 @@ class ShellOptions {
   const char* icu_data_file;
   const char* natives_blob;
   const char* snapshot_blob;
+
+ private:
+  base::Atomic32 script_executed_;
+  base::Atomic32 last_run_;
 };
 
 #ifdef V8_SHARED