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vpx_int_pro_col_sse2: use unaligned loads

this fixes a segfault when scaling is enabled; in some cases depending
on the ratio offsets may become odd.

vpx_int_pro_row_sse2 was updated previously, though the reason wasn't
listed:
54eda13f8 Apply fast motion search to golden reference frame

BUG=webm:1600

Change-Id: I8d5e105d876d8cf917919da301fce362adffab95

--- a/vpx_dsp/x86/avg_intrin_sse2.c

+++ b/vpx_dsp/x86/avg_intrin_sse2.c

@@ -515,7 +515,7 @@

 int16_t vpx_int_pro_col_sse2(const uint8_t *ref, const int width) {

   __m128i zero = _mm_setzero_si128();

-  __m128i src_line = _mm_load_si128((const __m128i *)ref);

+  __m128i src_line = _mm_loadu_si128((const __m128i *)ref);

   __m128i s0 = _mm_sad_epu8(src_line, zero);

   __m128i s1;

   int i;

@@ -522,7 +522,7 @@

   for (i = 16; i < width; i += 16) {

     ref += 16;

-    src_line = _mm_load_si128((const __m128i *)ref);

+    src_line = _mm_loadu_si128((const __m128i *)ref);

     s1 = _mm_sad_epu8(src_line, zero);

     s0 = _mm_adds_epu16(s0, s1);

   }