Revert "Revert adoption of CUDA indexing in general - this can only work with later versions of the compiler, just like module based dispatch, and thus must be guarded against usage in earlier (e.g. 1.6) versions."

This reverts commit 1c50968


[ROCm/hip commit: 32e11e7dc6]

projects/hip/src/hip_memory.cpp

@@ -1307,9 +1307,9 @@ namespace
     __global__
     void hip_fill_n(RandomAccessIterator f, N n, T value)
     {
-        const uint32_t grid_dim = hipGridDim_x * hipBlockDim_x;
+        const uint32_t grid_dim = gridDim.x * blockDim.x;
 
-        size_t idx = hipBlockIdx_x * block_dim + hipThreadIdx_x;
+        size_t idx = blockIdx.x * block_dim + threadIdx.x;
         while (idx < n) {
             __builtin_memcpy(
                 reinterpret_cast<void*>(&f[idx]),