[SYCL] Fix an error in handler::copy, fix mem-leak/SegFault in LIT test

[v-klochkov]

Signed-off-by: Vyacheslav N Klochkov [email protected]

[v-klochkov]

The original motivation for the fix was a SegFault reported in such trivial case on Linux:

#include <memory>
#include <iostream>
struct A {
  A() { std::cout << "Init\n"; }
  ~A() { std::cout << "Free\n"; }
};
int main() {
  { std::cout << "good1:\n"; std::shared_ptr<A[]> good1(new A[5]); }
  { std::cout << "good2:\n"; std::shared_ptr<A>   good2(new A[5], [](A *p) {delete[] p;}); }
  { std::cout << "baad1:\n"; std::shared_ptr<A>   baad1(new A[5]); }
  
  return 0;
}

Fixing the LIT test that had similar bad pattern code revealed a weakness in handler.hpp, which was also fixed.