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vp8_fdct4x4_test: align input and output buffers

fixes segfault in 32-bit builds

Change-Id: I5b3cc5a335cb236a6ec4cb11fa8feb54ae0182c7

--- a/test/vp8_fdct4x4_test.cc

+++ b/test/vp8_fdct4x4_test.cc

@@ -21,6 +21,7 @@

 #include "./vp8_rtcd.h"

 #include "test/acm_random.h"

 #include "vpx/vpx_integer.h"

+#include "vpx_ports/mem.h"

 namespace {

@@ -154,9 +155,9 @@

   double total_error = 0;

   const int count_test_block = 1000000;

   for (int i = 0; i < count_test_block; ++i) {

-    int16_t test_input_block[16];

+    DECLARE_ALIGNED(16, int16_t, test_input_block[16]);

+    DECLARE_ALIGNED(16, int16_t, test_output_block[16]);

     int16_t test_temp_block[16];

-    int16_t test_output_block[16];

     // Initialize a test block with input range [-255, 255].

     for (int j = 0; j < 16; ++j) {