[SYCL] Fix accessor::swap() method (#7201)

Need to swap new member MAccData (added in
01e60f7) in addition to Impl.

Author: KornevNikita

sycl/include/sycl/accessor.hpp

@@ -1949,7 +1949,12 @@ class __SYCL_SPECIAL_CLASS __SYCL_TYPE(accessor) accessor :
 #endif
   }
 
-  void swap(accessor &other) { std::swap(impl, other.impl); }
+  void swap(accessor &other) {
+    std::swap(impl, other.impl);
+#ifndef __SYCL_DEVICE_ONLY__
+    std::swap(MAccData, other.MAccData);
+#endif
+  }
 
   constexpr bool is_placeholder() const { return IsPlaceH; }