am af00228b: Revert "libc: memmove(): non-overlapping block optim."

Merge commit 'af00228b705b53165c132a22b30c2d6cbb9acd13' into gingerbread-plus-aosp

* commit 'af00228b705b53165c132a22b30c2d6cbb9acd13':
  Revert "libc: memmove(): non-overlapping block optim."