[Isolates] Convert more static data either to read-only or to per-isolate.

src/platform-win32.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 708 matching lines @@
   FILE* result;
   if (fopen_s(&result, path, mode) == 0) {
     return result;
   } else {
     return NULL;
   }
 }
 
 
 // Open log file in binary mode to avoid /n -> /r/n conversion.
-const char* OS::LogFileOpenMode = "wb";
+const char* const OS::LogFileOpenMode = "wb";
 
 
 // Print (debug) message to console.
 void OS::Print(const char* format, ...) {
   va_list args;
   va_start(args, format);
   VPrint(format, args);
   va_end(args);
 }
 
@@ skipping 1208 matching lines @@
 
   // Release the thread handles
   CloseHandle(data_->sampler_thread_);
   CloseHandle(data_->profiled_thread_);
 }
 
 
 #endif  // ENABLE_LOGGING_AND_PROFILING
 
 } }  // namespace v8::internal