Avoid aggregate graph access descriptor initialization (#2688)

Author: rwgk

cuda_core/cuda/core/graph/_graph_node.pyx

@@ -845,18 +845,18 @@ cdef inline AllocNode GN_alloc(GraphNode self, size_t size, object device,
         num_deps = 1
 
     cdef vector[cydriver.CUmemAccessDesc] access_descs
+    cdef cydriver.CUmemAccessDesc access_desc
     cdef int peer_id
     cdef list peer_ids = []
 
     if peer_access is not None:
         for peer_dev in peer_access:
             peer_id = getattr(peer_dev, 'device_id', peer_dev)
             peer_ids.append(peer_id)
-            access_descs.push_back(cydriver.CUmemAccessDesc_st(
-                cumemlocation_from_id(
-                    cydriver.CUmemLocationType.CU_MEM_LOCATION_TYPE_DEVICE, peer_id),
-                cydriver.CUmemAccess_flags.CU_MEM_ACCESS_FLAGS_PROT_READWRITE,
-            ))
+            access_desc.location = cumemlocation_from_id(
+                cydriver.CUmemLocationType.CU_MEM_LOCATION_TYPE_DEVICE, peer_id)
+            access_desc.flags = cydriver.CUmemAccess_flags.CU_MEM_ACCESS_FLAGS_PROT_READWRITE
+            access_descs.push_back(access_desc)
 
     cdef str memory_type_str = "device" if memory_type is None else str(memory_type)