Add a test for amd64 basic instructions, with particular emphasis on testing
condition codes. This is originally by Fabrice Bellard (GPL2+'d), with MD5
support from Alexander Peslyak (public domain) and has been extended to cover
ADOX and ADCX as per bug #360415.
The program generates more than 800MB of output, which it MD5 sums, so the final
MD5 sum serves as the pass/fail check. It takes roughly a minute to run.