Fix d8's interactive shell.

src/d8.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_D8_H_
 #define V8_D8_H_
 
 #ifndef V8_SHARED
 #include "allocation.h"
 #include "hashmap.h"
@@ skipping 195 matching lines @@
      expected_to_throw(false),
      mock_arraybuffer_allocator(false),
      num_isolates(1),
      isolate_sources(NULL),
      icu_data_file(NULL) { }
 
   ~ShellOptions() {
     delete[] isolate_sources;
   }
 
+  bool use_interactive_shell() {
+    return (interactive_shell || !script_executed) && !test_shell;
+  }
+
   bool script_executed;
   bool last_run;
   bool send_idle_notification;
   bool stress_opt;
   bool stress_deopt;
   bool interactive_shell;
   bool test_shell;
   bool dump_heap_constants;
   bool expected_to_throw;
   bool mock_arraybuffer_allocator;
@@ skipping 163 matching lines @@
   static void ExternalArrayWeakCallback(Isolate* isolate,
                                         Persistent<Object>* object,
                                         uint8_t* data);
 };
 
 
 }  // namespace v8
 
 
 #endif  // V8_D8_H_