Kill FXSYS_mem{cpy,cmp,set.move}{32,8}.

At one point in time, it may have made sense to indicate the
expected alignment of the memory you're about to copy, but that
was last century. The compiler will take care of it just fine.

I stopped short of removing the FXSYS_ wrapper macros entirely.

R=thestig@chromium.org

Review URL: https://codereview.chromium.org/1179693003.
73 files changed