Replace memcpy with vpx_memcpy

Also removed obselete comment

Change-Id: Iae1664777d76383639c637ee786e0d50fc45819a
diff --git a/vp9/common/vp9_convolve.c b/vp9/common/vp9_convolve.c
index abedf6b..1705402 100644
--- a/vp9/common/vp9_convolve.c
+++ b/vp9/common/vp9_convolve.c
@@ -282,7 +282,7 @@
   int r;
 
   for (r = h; r > 0; --r) {
-    memcpy(dst, src, w);
+    vpx_memcpy(dst, src, w);
     src += src_stride;
     dst += dst_stride;
   }
diff --git a/vp9/common/vp9_findnearmv.c b/vp9/common/vp9_findnearmv.c
index 49a731f..73f6b4c 100644
--- a/vp9/common/vp9_findnearmv.c
+++ b/vp9/common/vp9_findnearmv.c
@@ -54,7 +54,7 @@
 
   dst_list[1].as_int = 0;
   if (block_idx == 0) {
-    memcpy(dst_list, mv_list, MAX_MV_REF_CANDIDATES * sizeof(int_mv));
+    vpx_memcpy(dst_list, mv_list, MAX_MV_REF_CANDIDATES * sizeof(int_mv));
   } else if (block_idx == 1 || block_idx == 2) {
     int dst = 0, n;
     union b_mode_info *bmi = mi->bmi;
diff --git a/vp9/encoder/vp9_rdopt.c b/vp9/encoder/vp9_rdopt.c
index 041316b..f00cd14 100644
--- a/vp9/encoder/vp9_rdopt.c
+++ b/vp9/encoder/vp9_rdopt.c
@@ -2242,11 +2242,9 @@
   vpx_memcpy(ctx->zcoeff_blk, x->zcoeff_blk[xd->this_mi->mbmi.tx_size],
              sizeof(ctx->zcoeff_blk));
 
-  // FIXME(rbultje) does this memcpy the whole array? I believe sizeof()
-  // doesn't actually work this way
-  memcpy(ctx->tx_rd_diff, tx_size_diff, sizeof(ctx->tx_rd_diff));
-  memcpy(ctx->best_filter_diff, best_filter_diff,
-         sizeof(*best_filter_diff) * (SWITCHABLE_FILTERS + 1));
+  vpx_memcpy(ctx->tx_rd_diff, tx_size_diff, sizeof(ctx->tx_rd_diff));
+  vpx_memcpy(ctx->best_filter_diff, best_filter_diff,
+             sizeof(*best_filter_diff) * (SWITCHABLE_FILTERS + 1));
 }
 
 static void setup_pred_block(const MACROBLOCKD *xd,