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[CodeGen] Use RegUnits to track register aliases in AArch64RedundantCopyElimination. (NFC)
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Authored by mcrosier on May 23 2018, 9:50 AM.

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mcrosier created this revision.May 23 2018, 9:50 AM
This revision is now accepted and ready to land.May 23 2018, 10:02 AM
junbuml accepted this revision.May 23 2018, 10:14 AM

LGTM too. DomBBUsedRegs and OptBBUsedRegs are not really used, but keeping both DefedRegs and UsedRegs seems clearer than creating extra functions in LiveRegUnits.

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