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[NFC][Regalloc] Type 2 statics in terms of Register

Authored by mtrofin on Oct 19 2020, 11:10 AM.

Description

[NFC][Regalloc] Type 2 statics in terms of Register

Using Register instead of unsigned.

Also added isStack to mirror the other members, and eventually remove
the static testers.

Differential Revision: https://reviews.llvm.org/D89718

Details