Nuke OS::ReleaseStore, use Release_Store instead

src/platform-openbsd.cc

Index: src/platform-openbsd.cc
diff --git a/src/platform-openbsd.cc b/src/platform-openbsd.cc
index 0a7cc80f3db1538a1b65be5b4ff21a549c3d16ad..f2d9dd48cb734a3cc6b1abdc05a1563e1235b839 100644
--- a/src/platform-openbsd.cc
+++ b/src/platform-openbsd.cc
@@ -117,13 +117,6 @@ int OS::ActivationFrameAlignment() {
 }
 
 
-void OS::ReleaseStore(volatile AtomicWord* ptr, AtomicWord value) {
-  __asm__ __volatile__("" : : : "memory");
-  // An x86 store acts as a release barrier.
-  *ptr = value;
-}
-
-
 const char* OS::LocalTimezone(double time) {
   if (std::isnan(time)) return "";
   time_t tv = static_cast<time_t>(floor(time/msPerSecond));