When measuring speed gain of mem*() in utils test on host, there are too
many reasons that the results may be fluctuate. This gets even worse
when the unit tests run on buildbots. Let's only check for speed gain on
device.
BUG=chromium:351870
TEST=Check the speed gain check assertion is not compiled.
BRANCH=None
Change-Id: I0369d07d1da8cbb469d3a2a9d846406415c06745
Signed-off-by: Vic Yang <victoryang@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/189804
Reviewed-by: Daisuke Nojiri <dnojiri@chromium.org>
Reviewed-by: Vincent Palatin <vpalatin@chromium.org>