This reverts commit 8c42237b.

Because ssse3 code is used for the reference, the qcoeff and dqcoeff
reference buffers must be aligned.

Original change's description:
> quantize avx: copy 32x32 implementation
>
> Ensure avx and ssse3 stay in sync by testing them against each other.
>
> Change-Id: I699f3b48785c83260825402d7826231f475f697c

Change-Id: Ieeef11b9406964194028b0d81d84bcb63296ae06