[SYCL] Make a test class trivially copyable in multi_ptr.cpp (#555)

The class 'point' is used to test 'multi_ptr'. A 'sycl::buffer' for instances
of the class is created and the class must be a trivially copyable to be trait
as device copyable. Otherwise a compilation error will be generated after
a new check for device copyability in the 'sycl::buffer' class, see
intel/llvm#4914.

Signed-off-by: Pavel Samolysov <[email protected]>

Author: psamolysov-intel

SYCL/Basic/multi_ptr.cpp

@@ -30,7 +30,7 @@ template <typename T> class testMultPtrKernel;
 template <typename T> class testMultPtrArrowOperatorKernel;
 
 template <typename T> struct point {
-  point(const point &rhs) : x(rhs.x), y(rhs.y) {}
+  point(const point &rhs) = default;
   point(T x, T y) : x(x), y(y) {}
   point(T v) : x(v), y(v) {}
   point() : x(0), y(0) {}