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Add support for branch forms of ALU instructions to Cortex-A57 model

Authored by evgeny777 on Nov 24 2020, 12:43 AM.

Description

Add support for branch forms of ALU instructions to Cortex-A57 model

Patch fixes scheduling of ALU instructions which modify pc register. Patch
also fixes computation of mutually exclusive predicates for sequences of
variants to be properly expanded

Differential revision: https://reviews.llvm.org/D91266