fix alignment exceptions

some SSE optimizations were using an instruction sequence that required
128-bit alignment, even though this is not always guaranteed. The error
was in handling a 64-bit entity; made the same macro changes that had
been done previously for 32-bit entities.

Bug: 63586076
Test: successful playback of purchased movie from playmovies.
(cherry picked from commit e5c277c6)

Change-Id: I5638bc3a94894c406c92f4aea1b699693ba6ed04