Common: Fix mask generation in BitField

Fixes #913

src/common/bit_field.h

@@ -188,7 +188,7 @@ private:
 
     __forceinline StorageType GetMask() const
     {
-        return ((~(StorageTypeU)0) >> (8 * sizeof(T)-bits)) << position;
+        return (((StorageTypeU)~0) >> (8 * sizeof(T)-bits)) << position;
     }
 
     StorageType storage;