Remove AdaptiveCpp workaround in dpl_shim.h to allow for automatic prefetch optimization (UoB-HPC#177)

Author: illuhad

src/dpl_shim.h

@@ -55,22 +55,10 @@ static constexpr auto exe_policy = std::execution::par_unseq;
 #endif
 
 #ifdef USE_STD_PTR_ALLOC_DEALLOC
-
-#if defined(__HIPSYCL__) || defined(__OPENSYCL__)
-#include <CL/sycl.hpp>
-
-// 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
 template<typename T>
 T *alloc_raw(size_t size) { return (T *) aligned_alloc(ALIGNMENT, sizeof(T) * size); }
 
 template<typename T>
 void dealloc_raw(T *ptr) { free(ptr); }
-#endif
 
 #endif