add more math benchmarks

Change-Id: Ib025a4f47a43681953293284f62f31e8ae5c7877
Signed-off-by: Dirk Rettschlag <dirk.rettschlag@gmail.com>
Revert "bionic: update memmove for 32 bits atomic"

This reverts commit 18a8907c4efb82f839959cce3cec442a96d87f8e.
Revert "add more math benchmarks"

This reverts commit 3e14ecfc2b4c7a8e50bcf2977c3230fd6db4b3e5.