[redcode/crythread-2nd-pass] replaced remaining CryInterlocked* usage with equivalent AZStd version

Signed-off-by: AMZN-ScottR <24445312+AMZN-ScottR@users.noreply.github.com>

Code/Legacy/CryCommon/IFunctorBase.h

@@ -15,6 +15,8 @@
 #pragma once
 
 
+#include <AzCore/std/parallel/atomic.h>
+
 // Base class for functor storage.
 // Not intended for direct usage.
 class IFunctorBase
@@ -27,19 +29,19 @@ public:
 
     void AddRef()
     {
-        CryInterlockedIncrement(&m_nReferences);
+        m_nReferences.fetch_add(1, AZStd::memory_order_acq_rel);
     }
 
     void Release()
     {
-        if (CryInterlockedDecrement(&m_nReferences) <= 0)
+        if (m_nReferences.fetch_sub(1, AZStd::memory_order_acq_rel) == 1)
         {
             delete this;
         }
     }
 
 protected:
-    volatile int m_nReferences;
+    AZStd::atomic_int m_nReferences;
 };
 
 // Base Template for specialization.