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i#511 drreg: fix 2 bugs in aflags-in-xax

Merged Derek Bruening requested to merge i511-fix-aflags-in-xax into master

Fixes two bugs from 00d39c73 on keeping aflags in eax where possible:

  1. We were failing to give up the xax register after an app aflags write.

  2. If xax is unreserved but unrestored we were re-spilling it to a new slot, leaking the old slot.

A test is forthcoming but requires a fix for i#2351 first.