base/encoding: add an allocations performance test (#22946)
This MR adds the performance test program from #22946 (closed) as a testsuite test. By landing this prior to !9948 (closed), we gain before and after numbers for these allocations.
Due to a large amount of spam we do not allow new users to create repositories, they are "external" users. If you are a new user and want to create a repository, for example for forking GHC, open a new issue on ghc/ghc using the "get-verified" issue template
This MR adds the performance test program from #22946 (closed) as a testsuite test. By landing this prior to !9948 (closed), we gain before and after numbers for these allocations.