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vp8 bilinear: ensure temp array is aligned

Loads and stores to this array require 16 byte alignment.

BUG=webm:1570

Change-Id: I82c7d21c9539a108930fd030d79caaa0bcd1eeb3

--- a/vp8/common/x86/bilinear_filter_sse2.c

+++ b/vp8/common/x86/bilinear_filter_sse2.c

@@ -131,7 +131,7 @@

 void vp8_bilinear_predict16x16_sse2(uint8_t *src_ptr, int src_pixels_per_line,

                                     int xoffset, int yoffset, uint8_t *dst_ptr,

                                     int dst_pitch) {

-  uint16_t FData[16 * 17];

+  DECLARE_ALIGNED(16, uint16_t, FData[16 * 17]);

   assert((xoffset | yoffset) != 0);