message: dnn(ocl4dnn): drop weights_buf
  avoid memory access violation during "prefetch" stage
diff: @@ -280,15 +280,6 @@ convolve_simd(
  in_addr += INPUT_PITCH;
  - Dtype weight_buf[WEIGHT_PREF];
  - int w_idx=0;
  -
  - for (int i = 0; i < WEIGHT_PREF; i++)
  - {
  - weight_buf[i] = weights[weight_addr];
  - weight_addr += SIMD_SIZE;
  - }
  -
  #define BLOCK_IN(n, c) intel_sub_group_shuffle(in_buf[n], (c))
  int kr = 0; // kr = Kernel Row
  @@ -297,20 +288,18 @@ convolve_simd(
  int kc = 0; // kc = Kernel Column
  LOOP(KERNEL_WIDTH, kc,
  {
  + Dtype weight_value = weights[weight_addr];
  + weight_addr += SIMD_SIZE;
  for (int br=0; br < OUT_BLOCK_HEIGHT; br++)
  {
  for(int bc=0; bc < OUT_BLOCK_WIDTH; bc++)
  {
  Dtype input = BLOCK_IN((br * STRIDE_Y + kr * DILATION_Y), bc * STRIDE_X + kc * DILATION_X);
  - out[br * OUT_BLOCK_WIDTH + bc] = mad(weight_buf[w_idx % WEIGHT_PREF], input, out[br * OUT_BLOCK_WIDTH + bc]);
  + out[br * OUT_BLOCK_WIDTH + bc] = mad(weight_value, input, out[br * OUT_BLOCK_WIDTH + bc]);
  }
  }
  - weight_buf[w_idx % WEIGHT_PREF] = weights[weight_addr];
  - weight_addr += SIMD_SIZE;
  - ++w_idx;
  });
  });
  - weight_addr -= WEIGHT_PREF * SIMD_SIZE;
  }
  fm = fm % ALIGNED_NUM_FILTERS;
  