Move the loads of AES::EK to the top of the loop.
Move the loads of AES::EK to the top of the loop.

Before:
$ ./check --bench-algo=AES-128,AES-256 --seconds=10
AES-128:                   101.99 MiB/sec
AES-256:                    78.30 MiB/sec

After:
$ ./check --bench-algo=AES-128,AES-256 --seconds=10
AES-128:                   106.51 MiB/sec
AES-256:                    84.26 MiB/sec

randombit/botan,Rohde-Schwarz-Cybersecurity/botan,webmaster128/botan,Rohde-Schwarz-Cybersecurity/botan,randombit/botan,webmaster128/botan,Rohde-Schwarz-Cybersecurity/botan,Rohde-Schwarz-Cybersecurity/botan,Rohde-Schwarz-Cybersecurity/botan,webmaster128/botan,webmaster128/botan,webmaster128/botan,Rohde-Schwarz-Cybersecurity/botan,randombit/botan,randombit/botan,randombit/botan