vp9_full_search_sadx[38]: align sad arrays

the sse4 code expects 16-byte aligned arrays; vp8 already had a similar
change applied:
b2aa401 Align SAD output array to be 16-byte aligned

Change-Id: I5e902035e5a87e23309e151113f3c0d4a8372226

vp9/encoder/vp9_mcomp.c

diff --git a/vp9/encoder/vp9_mcomp.c b/vp9/encoder/vp9_mcomp.c
index 9602eb5..1f5f08a 100644
--- a/vp9/encoder/vp9_mcomp.c
+++ b/vp9/encoder/vp9_mcomp.c
@@ -2017,7 +2017,7 @@
     if (fn_ptr->sdx3f != NULL) {
       while ((c + 2) < col_max) {
         int i;
-        unsigned int sads[3];
+        DECLARE_ALIGNED(16, uint32_t, sads[3]);
 
         fn_ptr->sdx3f(what->buf, what->stride, check_here, in_what->stride,
                       sads);
@@ -2082,7 +2082,7 @@
     if (fn_ptr->sdx8f != NULL) {
       while ((c + 7) < col_max) {
         int i;
-        unsigned int sads[8];
+        DECLARE_ALIGNED(16, uint32_t, sads[8]);
 
         fn_ptr->sdx8f(what->buf, what->stride, check_here, in_what->stride,
                       sads);
@@ -2106,7 +2106,7 @@
     if (fn_ptr->sdx3f != NULL) {
       while ((c + 2) < col_max) {
         int i;
-        unsigned int sads[3];
+        DECLARE_ALIGNED(16, uint32_t, sads[3]);
 
         fn_ptr->sdx3f(what->buf, what->stride, check_here, in_what->stride,
                       sads);