Use malloc_shared for hipSYCL stdpar in shim with --hipsycl-stdpar-sy…

…stem-usm for now

src/std-indices/dpl_shim.h

@@ -68,9 +68,13 @@ static constexpr auto EXEC_POLICY = std::execution::par_unseq;
 #ifdef USE_STD_PTR_ALLOC_DEALLOC
 
   #if defined(__HIPSYCL__) || defined(__OPENSYCL__)
+    #include <CL/sycl.hpp>
 
-template <typename T> T *alloc_raw(size_t size) { return new T[size]; }
-template <typename T> void dealloc_raw(T *ptr) { delete[] ptr; }
+// TODO We temporarily use malloc_shared/free here for hipSYCL stdpar because there's a linking issue if we let it hijack new/delete
+//  for this to work, we compile with --hipsycl-stdpar-system-usm so that hijacking is disabled
+static cl::sycl::queue queue{cl::sycl::default_selector_v};
+template <typename T> T *alloc_raw(size_t size) { return cl::sycl::malloc_shared<T>(size, queue); }
+template <typename T> void dealloc_raw(T *ptr) { cl::sycl::free(ptr, queue); }
 
   #else