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dct tests: align InvAccuracyCheck buffers

'in' is used for the reference fdct. 'coeff' is input to the idct being
tested and 'dst[16]' is output

Fixes a segfault on unaligned memory access on x86.

Change-Id: I3691b1380ed49986897dd89a63ce63a80a0e0962

--- a/test/dct_test.cc

+++ b/test/dct_test.cc

@@ -307,13 +307,13 @@

     const int count_test_block = 1000;

     Buffer<int16_t> in = Buffer<int16_t>(size_, size_, 4);

     ASSERT_TRUE(in.Init());

-    Buffer<tran_low_t> coeff = Buffer<tran_low_t>(size_, size_, 0);

+    Buffer<tran_low_t> coeff = Buffer<tran_low_t>(size_, size_, 0, 16);

     ASSERT_TRUE(coeff.Init());

-    Buffer<uint8_t> dst = Buffer<uint8_t>(size_, size_, 0);

+    Buffer<uint8_t> dst = Buffer<uint8_t>(size_, size_, 0, 16);

     ASSERT_TRUE(dst.Init());

     Buffer<uint8_t> src = Buffer<uint8_t>(size_, size_, 0);

     ASSERT_TRUE(src.Init());

-    Buffer<uint16_t> dst16 = Buffer<uint16_t>(size_, size_, 0);

+    Buffer<uint16_t> dst16 = Buffer<uint16_t>(size_, size_, 0, 16);

     ASSERT_TRUE(dst16.Init());

     Buffer<uint16_t> src16 = Buffer<uint16_t>(size_, size_, 0);

     ASSERT_TRUE(src16.Init());