Work around change in cuTensorMapEncode (#1567)

Previously we were able to pass in `nullptr` in case of empty strides. However, they added some bound checking which fails in that case.

Fixes nvbug4575531

libcudacxx/test/libcudacxx/cuda/barrier/cp_async_bulk_tensor_generic.h

@@ -216,10 +216,11 @@ CUtensorMap map_encode(T *tensor_ptr, const cuda::std::array<uint64_t, num_dims>
 
     // The stride is the number of bytes to traverse from the first element of one row to the next.
     // It must be a multiple of 16.
-    constexpr int num_strides = num_dims - 1;
-    cuda::std::array<uint64_t, num_strides> stride;
+    // cuTensorMapEncodeTiled requies that the stride array is a valid pointer, so we add one superfluous element
+    // This is necessary for num_dims == 1
+    cuda::std::array<uint64_t, num_dims> stride;
     uint64_t base_stride = sizeof(T);
-    for (size_t i = 0; i < stride.size(); ++i) {
+    for (size_t i = 0; i < stride.size() - 1; ++i) {
         base_stride *= gmem_dims[i];
         stride[i] = base_stride;
     }