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iX: demonstrate broken aflags and reg restore on fault

Closed Abhinav Anil Sharma requested to merge iX-aflags-restore-xax into master

Demonstrates issues with drreg restore state logic on faults:

  • restore-on-fault for aflags is broken when they are not spilled to any slot, but simply stored in xax
  • restore-on-fault for gpr is broken when the gpr is read by an app instr before fault