Bug fix: Issue 531:	MMX code tries to read from SSE2 register
Bug fix: Issue 531:	MMX code tries to read from SSE2 register

Reported by Krzysztof Kaspruk.
https://code.google.com/p/webm/issues/detail?id=531

Change-Id: Ib5d5878ad07707bd42c2ca833eb021004f537012

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