Removed explicit mfence in atomic_fence on Windows.

The necessary instructions according to the memory order argument
should already be generated by std::atomic_thread_fence.

Signed-off-by: Andrey Semashev <andrey.semashev@gmail.com>

include/oneapi/tbb/detail/_machine.h

@@ -79,10 +79,6 @@ using std::this_thread::yield;
 // atomic_fence implementation
 //--------------------------------------------------------------------------------------------------
 
-#if _MSC_VER && (__TBB_x86_64 || __TBB_x86_32)
-#pragma intrinsic(_mm_mfence)
-#endif
-
 static inline void atomic_fence(std::memory_order order) {
 #if (__TBB_x86_64 || __TBB_x86_32) && defined(__GNUC__) && __GNUC__ < 11
     if (order == std::memory_order_seq_cst)
@@ -95,16 +91,6 @@ static inline void atomic_fence(std::memory_order order) {
         __asm__ __volatile__ ("" ::: "memory");
     }
 #else
-#if _MSC_VER && (__TBB_x86_64 || __TBB_x86_32)
-    if (order == std::memory_order_seq_cst ||
-        order == std::memory_order_acq_rel ||
-        order == std::memory_order_acquire ||
-        order == std::memory_order_release )
-    {
-        _mm_mfence();
-        return;
-    }
-#endif /*_MSC_VER && (__TBB_x86_64 || __TBB_x86_32)*/
     std::atomic_thread_fence(order);
 #endif
 }