SWDEV-559166 - Fix potential data race in ReferenceCountedObject::release() (#1388)

Use fetch_sub(std::memory_order_acq_rel) on release
so the destroying thread acquires prior writes.

projects/clr/rocclr/platform/runtime.cpp

@@ -134,7 +134,7 @@ uint ReferenceCountedObject::retain() {
 }
 
 uint ReferenceCountedObject::release() {
-  uint newCount = referenceCount_.fetch_sub(1, std::memory_order_relaxed) - 1;
+  uint newCount = referenceCount_.fetch_sub(1, std::memory_order_acq_rel) - 1;
   if (newCount == 0) {
     if (terminate()) {
       // The destructor should be called with a count==1 for the last thread