Align memory allocation for SIMD operations
Align memory allocation for SIMD operations

Change-Id: I035d4a3b14e6c56a55b06dea57b4a49cd161e69f

luctrudeau/aom,smarter/aom,GrokImageCompression/aom,luctrudeau/aom,smarter/aom,luctrudeau/aom,GrokImageCompression/aom,smarter/aom,luctrudeau/aom,GrokImageCompression/aom,GrokImageCompression/aom,smarter/aom,luctrudeau/aom,GrokImageCompression/aom,smarter/aom,smarter/aom,luctrudeau/aom,GrokImageCompression/aom