Unify Sampler implementation across platforms using signals to suspend thread

src/platform.h

 // Copyright 2012 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 81 matching lines @@
 #endif  // _MSC_VER
 
 // Random is missing on both Visual Studio and MinGW.
 int random();
 
 #endif  // WIN32
 
 #include "atomicops.h"
 #include "lazy-instance.h"
 #include "platform-tls.h"
-#include "sampler.h"
 #include "utils.h"
 #include "v8globals.h"
 
 namespace v8 {
 namespace internal {
 
 class Semaphore;
 class Mutex;
 
 double ceiling(double x);
@@ skipping 603 matching lines @@
   static uint16_t HToN(uint16_t value);
   static uint16_t NToH(uint16_t value);
   static uint32_t HToN(uint32_t value);
   static uint32_t NToH(uint32_t value);
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_PLATFORM_H_