Fix Ivy Bridge+ MEM_UOPS_RETIRED counters

[rstone]

Summary

The MEM_UOPS_RETIRED actually work the same way as the Sandy
Bridge counters, but the counters were documented in a different
way and that seemed to cause the Ivy Bridge counters to be
implemented incorrectly. Use the same counter definitions as
Sandy Bridge. While I'm here, rename the counters to match
what's documented in the datasheet.

[joe-thestackframe.org]

Looks good.

[rstone]

committed as r279835