QSemaphore: Fix warning in 32-bit build

qtbase\src\corelib\thread\qsemaphore.cpp(157): warning C4293: '>>': shift count negative or too big, undefined behavior

Change-Id: Iddf76e52770576bd57a4630884c0e0d6310cd4ff
Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io>
Reviewed-by: Allan Sandfeld Jensen <allan.jensen@qt.io>

src/corelib/thread/qsemaphore.cpp

@@ -154,7 +154,7 @@ static bool futexNeedsWake(quintptr v)
     // low 31 bits of the high word (that is, bits 32-62). If we're not, then we only
     // use futexNeedsWakeAllBit to indicate anyone is waiting.
     if constexpr (futexHasWaiterCount)
-        return (v >> 32) > (unsigned(v));
+        return unsigned(quint64(v) >> 32) > unsigned(v);
     return v >> 31;
 }