[Isolates] Merge crankshaft (r5922 from bleeding_edge).

src/flags.cc

 // 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 261 matching lines @@
 static void SplitArgument(const char* arg,
                           char* buffer,
                           int buffer_size,
                           const char** name,
                           const char** value,
                           bool* is_bool) {
   *name = NULL;
   *value = NULL;
   *is_bool = false;
 
-  if (*arg == '-') {
+  if (arg != NULL && *arg == '-') {
     // find the begin of the flag name
     arg++;  // remove 1st '-'
     if (*arg == '-') {
       arg++;  // remove 2nd '-'
       if (arg[0] == '\0') {
         const char* kJSArgumentsFlagName = "js_arguments";
         *name = kJSArgumentsFlagName;
         return;
       }
     }
@@ skipping 249 matching lines @@
 const char** JSArguments::argv() { return argv_; }
 const char*& JSArguments::operator[](int idx) { return argv_[idx]; }
 JSArguments& JSArguments::operator=(JSArguments args) {
     argc_ = args.argc_;
     argv_ = args.argv_;
     return *this;
 }
 
 
 } }  // namespace v8::internal