Add an --omit-quit flag to d8 for Emscripten's sake.

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 "src/allocation.h"
 #include "src/hashmap.h"
@@ skipping 178 matching lines @@
 };
 
 
 class ShellOptions {
  public:
   ShellOptions()
       : script_executed(false),
         last_run(true),
         send_idle_notification(false),
         invoke_weak_callbacks(false),
+        omit_quit(false),
         stress_opt(false),
         stress_deopt(false),
         interactive_shell(false),
         test_shell(false),
         dump_heap_constants(false),
         expected_to_throw(false),
         mock_arraybuffer_allocator(false),
         num_isolates(1),
         compile_options(v8::ScriptCompiler::kNoCompileOptions),
         isolate_sources(NULL),
         icu_data_file(NULL),
         natives_blob(NULL),
         snapshot_blob(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 invoke_weak_callbacks;
+  bool omit_quit;
   bool stress_opt;
   bool stress_deopt;
   bool interactive_shell;
   bool test_shell;
   bool dump_heap_constants;
   bool expected_to_throw;
   bool mock_arraybuffer_allocator;
   int num_isolates;
   v8::ScriptCompiler::CompileOptions compile_options;
   SourceGroup* isolate_sources;
@@ skipping 150 matching lines @@
   static Handle<ObjectTemplate> CreateGlobalTemplate(Isolate* isolate);
   static Handle<FunctionTemplate> CreateArrayBufferTemplate(FunctionCallback);
   static Handle<FunctionTemplate> CreateArrayTemplate(FunctionCallback);
 };
 
 
 }  // namespace v8
 
 
 #endif  // V8_D8_H_