include: Use GCC-style InterlockedCompareExchange128 implementation on clang in MSVC mode.

include/winnt.h

@@ -6918,9 +6918,6 @@ static inline BOOLEAN BitScanReverse(DWORD *index, DWORD mask)
 #pragma intrinsic(_InterlockedAnd)
 #pragma intrinsic(_InterlockedCompareExchange)
 #pragma intrinsic(_InterlockedCompareExchange64)
-#ifdef _WIN64
-#pragma intrinsic(_InterlockedCompareExchange128)
-#endif
 #pragma intrinsic(_InterlockedExchange)
 #pragma intrinsic(_InterlockedExchangeAdd)
 #pragma intrinsic(_InterlockedIncrement)
@@ -6932,9 +6929,6 @@ static inline BOOLEAN BitScanReverse(DWORD *index, DWORD mask)
 long      _InterlockedAnd(long volatile *,long);
 long      _InterlockedCompareExchange(long volatile*,long,long);
 long long _InterlockedCompareExchange64(long long volatile*,long long,long long);
-#ifdef _WIN64
-unsigned char _InterlockedCompareExchange128(volatile __int64 *, __int64, __int64, __int64 *);
-#endif
 long      _InterlockedDecrement(long volatile*);
 short     _InterlockedDecrement16(short volatile*);
 long      _InterlockedExchange(long volatile*,long);
@@ -6958,13 +6952,6 @@ static FORCEINLINE LONGLONG WINAPI InterlockedCompareExchange64( LONGLONG volati
     return _InterlockedCompareExchange64( (long long volatile *)dest, xchg, compare );
 }
 
-#ifdef _WIN64
-static FORCEINLINE unsigned char WINAPI InterlockedCompareExchange128( volatile __int64 *dest, __int64 xchg_high, __int64 xchg_low, __int64 *compare )
-{
-    return _InterlockedCompareExchange128( dest, xchg_high, xchg_low, compare );
-}
-#endif
-
 static FORCEINLINE LONG WINAPI InterlockedExchange( LONG volatile *dest, LONG val )
 {
     return _InterlockedExchange( (long volatile *)dest, val );
@@ -7082,23 +7069,6 @@ static FORCEINLINE LONGLONG WINAPI InterlockedCompareExchange64( LONGLONG volati
     return __sync_val_compare_and_swap( dest, compare, xchg );
 }
 
-#ifdef _WIN64
-static FORCEINLINE unsigned char InterlockedCompareExchange128( volatile __int64 *dest, __int64 xchg_high, __int64 xchg_low, __int64 *compare )
-{
-#ifdef __x86_64__
-    unsigned char ret;
-    __asm__ __volatile__( "lock cmpxchg16b %0; setz %b2"
-                          : "=m" (dest[0]), "=m" (dest[1]), "=r" (ret),
-                            "=a" (compare[0]), "=d" (compare[1])
-                          : "m" (dest[0]), "m" (dest[1]), "3" (compare[0]), "4" (compare[1]),
-                            "c" (xchg_high), "b" (xchg_low) );
-    return ret;
-#else
-    return __sync_bool_compare_and_swap( (__int128 *)dest, *(__int128 *)compare, ((__int128)xchg_high << 64) | xchg_low );
-#endif
-}
-#endif
-
 static FORCEINLINE LONG WINAPI InterlockedExchange( LONG volatile *dest, LONG val )
 {
     LONG ret;
@@ -7165,6 +7135,36 @@ static FORCEINLINE void MemoryBarrier(void)
 
 #endif  /* __GNUC__ */
 
+#ifdef _WIN64
+#if defined(_MSC_VER) && !defined(__clang__)
+
+#pragma intrinsic(_InterlockedCompareExchange128)
+unsigned char _InterlockedCompareExchange128(volatile __int64 *, __int64, __int64, __int64 *);
+static FORCEINLINE unsigned char WINAPI InterlockedCompareExchange128( volatile __int64 *dest, __int64 xchg_high, __int64 xchg_low, __int64 *compare )
+{
+    return _InterlockedCompareExchange128( dest, xchg_high, xchg_low, compare );
+}
+
+#else
+
+static FORCEINLINE unsigned char InterlockedCompareExchange128( volatile __int64 *dest, __int64 xchg_high, __int64 xchg_low, __int64 *compare )
+{
+#ifdef __x86_64__
+    unsigned char ret;
+    __asm__ __volatile__( "lock cmpxchg16b %0; setz %b2"
+                          : "=m" (dest[0]), "=m" (dest[1]), "=r" (ret),
+                            "=a" (compare[0]), "=d" (compare[1])
+                          : "m" (dest[0]), "m" (dest[1]), "3" (compare[0]), "4" (compare[1]),
+                            "c" (xchg_high), "b" (xchg_low) );
+    return ret;
+#else
+    return __sync_bool_compare_and_swap( (__int128 *)dest, *(__int128 *)compare, ((__int128)xchg_high << 64) | xchg_low );
+#endif
+}
+
+#endif
+#endif
+
 static FORCEINLINE void YieldProcessor(void)
 {
 #ifdef __GNUC__