Mark AOM_QM matricies const.

These large (200 KB) static stables are functionally read-only. Marking
them const moves them to the read-only section of shared libraries,
reducing memory footprint when multiple application processes are
running simultaneously.

Change-Id: I6b66ea8f512147f9762728ae01cea02a0fa71300

av1/common/onyxc_int.h

diff --git a/av1/common/onyxc_int.h b/av1/common/onyxc_int.h
index 356d2ad..b02b275 100644
--- a/av1/common/onyxc_int.h
+++ b/av1/common/onyxc_int.h
@@ -348,13 +348,13 @@
 
 #if CONFIG_AOM_QM
   // Global quant matrix tables
-  qm_val_t *giqmatrix[NUM_QM_LEVELS][3][TX_SIZES_ALL];
-  qm_val_t *gqmatrix[NUM_QM_LEVELS][3][TX_SIZES_ALL];
+  const qm_val_t *giqmatrix[NUM_QM_LEVELS][3][TX_SIZES_ALL];
+  const qm_val_t *gqmatrix[NUM_QM_LEVELS][3][TX_SIZES_ALL];
 
   // Local quant matrix tables for each frame
-  qm_val_t *y_iqmatrix[MAX_SEGMENTS][TX_SIZES_ALL];
-  qm_val_t *u_iqmatrix[MAX_SEGMENTS][TX_SIZES_ALL];
-  qm_val_t *v_iqmatrix[MAX_SEGMENTS][TX_SIZES_ALL];
+  const qm_val_t *y_iqmatrix[MAX_SEGMENTS][TX_SIZES_ALL];
+  const qm_val_t *u_iqmatrix[MAX_SEGMENTS][TX_SIZES_ALL];
+  const qm_val_t *v_iqmatrix[MAX_SEGMENTS][TX_SIZES_ALL];
 
   // Encoder
   int using_qmatrix;

av1/common/quant_common.c

diff --git a/av1/common/quant_common.c b/av1/common/quant_common.c
index 3a70753..3d357d6 100644
--- a/av1/common/quant_common.c
+++ b/av1/common/quant_common.c
@@ -530,17 +530,18 @@
 }
 
 #if CONFIG_AOM_QM
-qm_val_t *aom_iqmatrix(AV1_COMMON *cm, int qmlevel, int plane,
-                       TX_SIZE tx_size) {
+const qm_val_t *aom_iqmatrix(AV1_COMMON *cm, int qmlevel, int plane,
+                             TX_SIZE tx_size) {
   return &cm->giqmatrix[qmlevel][plane][tx_size][0];
 }
-qm_val_t *aom_qmatrix(AV1_COMMON *cm, int qmlevel, int plane, TX_SIZE tx_size) {
+const qm_val_t *aom_qmatrix(AV1_COMMON *cm, int qmlevel, int plane,
+                            TX_SIZE tx_size) {
   return &cm->gqmatrix[qmlevel][plane][tx_size][0];
 }
 
 #define QM_TOTAL_SIZE 3344
-static uint16_t wt_matrix_ref[NUM_QM_LEVELS][2][QM_TOTAL_SIZE];
-static uint16_t iwt_matrix_ref[NUM_QM_LEVELS][2][QM_TOTAL_SIZE];
+static const uint16_t wt_matrix_ref[NUM_QM_LEVELS][2][QM_TOTAL_SIZE];
+static const uint16_t iwt_matrix_ref[NUM_QM_LEVELS][2][QM_TOTAL_SIZE];
 
 void aom_qm_init(AV1_COMMON *cm) {
   int q, c, t;
@@ -579,7 +580,7 @@
    frequency domain according to different nominal viewing
    distances.
  */
-static uint16_t iwt_matrix_ref[NUM_QM_LEVELS][2][QM_TOTAL_SIZE] = {
+static const uint16_t iwt_matrix_ref[NUM_QM_LEVELS][2][QM_TOTAL_SIZE] = {
   {
       { /* Luma */
         /* Size 4x4 */
@@ -7347,7 +7348,7 @@
   },
 };
 
-static uint16_t wt_matrix_ref[NUM_QM_LEVELS][2][QM_TOTAL_SIZE] = {
+static const uint16_t wt_matrix_ref[NUM_QM_LEVELS][2][QM_TOTAL_SIZE] = {
   {
       { /* Luma */
         /* Size 4x4 */

av1/common/quant_common.h

diff --git a/av1/common/quant_common.h b/av1/common/quant_common.h
index 398b23f..e09f5df 100644
--- a/av1/common/quant_common.h
+++ b/av1/common/quant_common.h
@@ -52,10 +52,10 @@
   return first + (qindex * (last + 1 - first)) / QINDEX_RANGE;
 }
 void aom_qm_init(struct AV1Common *cm);
-qm_val_t *aom_iqmatrix(struct AV1Common *cm, int qindex, int comp,
-                       TX_SIZE tx_size);
-qm_val_t *aom_qmatrix(struct AV1Common *cm, int qindex, int comp,
-                      TX_SIZE tx_size);
+const qm_val_t *aom_iqmatrix(struct AV1Common *cm, int qindex, int comp,
+                             TX_SIZE tx_size);
+const qm_val_t *aom_qmatrix(struct AV1Common *cm, int qindex, int comp,
+                            TX_SIZE tx_size);
 #endif  // CONFIG_AOM_QM
 
 #if CONFIG_NEW_QUANT