Add ability to clear cpuid bits before running benchmarks.
Add ability to clear cpuid bits before running benchmarks.

Should be extended further, and some duplicated logic with the tests here,
but useful as is.

[ci skip]

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