* Improve testing of memcpy including adding perf test.
* Change remaining_bytes to be branch free.
Use reciprocal division followed by multiply to remove a branch.
* Replace time measuring macro
The DO_TIME macro was used originally to get performance numbers. The
macro makes tests hard to debug. This commit replaces it with a proper
C++ class with destructor.
* Bug fix
If the superslab meta data is large, then the calculation for the
sizeclasses that could use the short slab was incorrect. This fixes
that calculation.
Co-authored-by: Nathaniel Wesley Filardo <nfilardo@microsoft.com>
