Jingning Han fabc783695 Fix an overflow issue in SSE2 forward ADST
The step that sums three input samples could potentially cause the
intermediate result go beyond 16 bit limit, when operating as the
second 1-D transform. This commit fixes the issue.

Change-Id: Iaf512449ac2d25ddd8a806d760afab362c62a516
2013-11-13 15:15:59 -08:00
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