Introduce --print-all-code flag and infrastructure for one flag to imply another flag.

src/flags.h

 // Copyright 2006-2008 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 54 matching lines @@
   // Set the flag values by parsing the string str. Splits string into argc
   // substrings argv[], each of which consisting of non-white-space chars,
   // and then calls SetFlagsFromCommandLine() and returns its result.
   static int SetFlagsFromString(const char* str, int len);
 
   // Reset all flags to their default value.
   static void ResetAllFlags();
 
   // Print help to stdout with flags, types, and default values.
   static void PrintHelp();
+
+  // Set flags as consequence of being implied by another flag.
+  static void EnforceFlagImplications();
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_FLAGS_H_