Use tx_size table in level map coding functions

Change-Id: I215c4bed9ba5c7f4fc93533249610217de14ce54

av1/decoder/decodetxb.c

diff --git a/av1/decoder/decodetxb.c b/av1/decoder/decodetxb.c
index c78fc4d..a6c8cdf 100644
--- a/av1/decoder/decodetxb.c
+++ b/av1/decoder/decodetxb.c
@@ -49,7 +49,7 @@
   const SCAN_ORDER *const scan_order =
       get_scan(cm, tx_size, tx_type, is_inter_block(mbmi));
   const int16_t *scan = scan_order->scan;
-  const int seg_eob = 16 << (tx_size << 1);
+  const int seg_eob = tx_size_2d[tx_size];
   int c = 0;
   int update_eob = -1;
   const int16_t *const dequant = xd->plane[plane].seg_dequant[mbmi->segment_id];

av1/encoder/encodetxb.c

diff --git a/av1/encoder/encodetxb.c b/av1/encoder/encodetxb.c
index 67c733c..85e71c0 100644
--- a/av1/encoder/encodetxb.c
+++ b/av1/encoder/encodetxb.c
@@ -79,7 +79,7 @@
   int c;
   int is_nz;
   const int bwl = b_width_log2_lookup[txsize_to_bsize[tx_size]] + 2;
-  const int seg_eob = 16 << (tx_size << 1);
+  const int seg_eob = tx_size_2d[tx_size];
   uint8_t txb_mask[32 * 32] = { 0 };
   uint16_t update_eob = 0;
 
@@ -255,7 +255,7 @@
   const int eob = p->eobs[block];
   const tran_low_t *const qcoeff = BLOCK_OFFSET(p->qcoeff, block);
   int c, cost;
-  const int seg_eob = AOMMIN(eob, (16 << (tx_size << 1)) - 1);
+  const int seg_eob = AOMMIN(eob, tx_size_2d[tx_size] - 1);
   int txb_skip_ctx = txb_ctx->txb_skip_ctx;
   aom_prob *nz_map = xd->fc->nz_map[tx_size][plane_type];