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Use aligned copy in 8x8 Hadamard transform SSE2

This reduces the 8x8 Hadamard transform cycles by 20%.

Change-Id: If34c5e02f3afa42244c6efabe121f7cf5d2df41b

--- a/vp9/encoder/x86/vp9_avg_intrin_sse2.c

+++ b/vp9/encoder/x86/vp9_avg_intrin_sse2.c

@@ -148,21 +148,21 @@

   hadamard_col8_sse2(src, 0);

   hadamard_col8_sse2(src, 1);

-  _mm_storeu_si128((__m128i *)coeff, src[0]);

+  _mm_store_si128((__m128i *)coeff, src[0]);

   coeff += 8;

-  _mm_storeu_si128((__m128i *)coeff, src[1]);

+  _mm_store_si128((__m128i *)coeff, src[1]);

   coeff += 8;

-  _mm_storeu_si128((__m128i *)coeff, src[2]);

+  _mm_store_si128((__m128i *)coeff, src[2]);

   coeff += 8;

-  _mm_storeu_si128((__m128i *)coeff, src[3]);

+  _mm_store_si128((__m128i *)coeff, src[3]);

   coeff += 8;

-  _mm_storeu_si128((__m128i *)coeff, src[4]);

+  _mm_store_si128((__m128i *)coeff, src[4]);

   coeff += 8;

-  _mm_storeu_si128((__m128i *)coeff, src[5]);

+  _mm_store_si128((__m128i *)coeff, src[5]);

   coeff += 8;

-  _mm_storeu_si128((__m128i *)coeff, src[6]);

+  _mm_store_si128((__m128i *)coeff, src[6]);

   coeff += 8;

-  _mm_storeu_si128((__m128i *)coeff, src[7]);

+  _mm_store_si128((__m128i *)coeff, src[7]);

 }

 void vp9_hadamard_16x16_sse2(int16_t const *src_diff, int src_stride,