Benchmarking std::rotate.

[DenisYaroshevskiy]

Bugzilla Link	40297
Version	unspecified
OS	All
CC	@mclow

Extended Description

This is an issue created for adding benchmarks to std::rotate.

[DenisYaroshevskiy]

I thought I would immediately submit a pull request, however I found out that I cannot at the moment explain the results I see.

It means that I will submit the pull request at a later date.