Nuke OS::ReleaseStore, use Release_Store instead

src/platform.h

Index: src/platform.h
diff --git a/src/platform.h b/src/platform.h
index 86706fe3c399855d4603b65fbe1f39ae03f4c3b4..24d21cb3aee129ba84df74a0b8b1037312b24a15 100644
--- a/src/platform.h
+++ b/src/platform.h
@@ -100,7 +100,6 @@ int random();
 
 #endif  // WIN32
 
-#include "atomicops.h"
 #include "lazy-instance.h"
 #include "platform-tls.h"
 #include "utils.h"
@@ -330,8 +329,6 @@ class OS {
   // the platform doesn't care. Guaranteed to be a power of two.
   static int ActivationFrameAlignment();
 
-  static void ReleaseStore(volatile AtomicWord* ptr, AtomicWord value);
-
 #if defined(V8_TARGET_ARCH_IA32)
   // Limit below which the extra overhead of the MemCopy function is likely
   // to outweigh the benefits of faster copying.