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[MachineVerifier] Refactor calcRegsPassed. NFC

Authored by evgeny777 on Aug 1 2020, 2:58 AM.

Description

[MachineVerifier] Refactor calcRegsPassed. NFC

Patch improves performance of verify-machineinstrs pass up to 10x.
Differential revision: https://reviews.llvm.org/D84105