Introduce mkgrokdump to update tools/v8heapconst.py.

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_
 
 #include <iterator>
 #include <memory>
 #include <string>
@@ skipping 274 matching lines @@
   ShellOptions()
       : script_executed(false),
         send_idle_notification(false),
         invoke_weak_callbacks(false),
         omit_quit(false),
         stress_opt(false),
         stress_deopt(false),
         stress_runs(1),
         interactive_shell(false),
         test_shell(false),
-        dump_heap_constants(false),
         expected_to_throw(false),
         mock_arraybuffer_allocator(false),
         enable_inspector(false),
         num_isolates(1),
         compile_options(v8::ScriptCompiler::kNoCompileOptions),
         isolate_sources(NULL),
         icu_data_file(NULL),
         natives_blob(NULL),
         snapshot_blob(NULL),
         trace_enabled(false),
@@ skipping 10 matching lines @@
 
   bool script_executed;
   bool send_idle_notification;
   bool invoke_weak_callbacks;
   bool omit_quit;
   bool stress_opt;
   bool stress_deopt;
   int stress_runs;
   bool interactive_shell;
   bool test_shell;
-  bool dump_heap_constants;
   bool expected_to_throw;
   bool mock_arraybuffer_allocator;
   bool enable_inspector;
   int num_isolates;
   v8::ScriptCompiler::CompileOptions compile_options;
   SourceGroup* isolate_sources;
   const char* icu_data_file;
   const char* natives_blob;
   const char* snapshot_blob;
   bool trace_enabled;
@@ skipping 152 matching lines @@
                            int index);
   static MaybeLocal<Module> FetchModuleTree(v8::Local<v8::Context> context,
                                             const std::string& file_name);
 };
 
 
 }  // namespace v8
 
 
 #endif  // V8_D8_H_