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[LiveRegUnits] Add phys_regs_and_masks iterator range (NFC).

Authored by fhahn on Dec 11 2019, 1:27 AM.

Description

[LiveRegUnits] Add phys_regs_and_masks iterator range (NFC).

This iterator range just includes physical registers and register masks,
which are interesting when dealing with register liveness.

Reviewers: evandro, t.p.northover, paquette, MatzeB, arsenm

Reviewed By: paquette

Differential Revision: https://reviews.llvm.org/D70562

Details