[PATCH] D84228: [CodeGen][TargetPassConfig] Add unreachable-mbb-elimination pass explicitly

[Yuanfang Chen via Phabricator via llvm-commits]

ychen added a comment.

This is an unfortunate limit of legacy pass manager lacking runtime pass instrumentation support. NPM has better support of this.

Does this mean that we run UnreachableMachineBlockElimID twice? This new addPass and the old addRequiredID? Is it safe to remove the addRequiredID case?


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  https://reviews.llvm.org/D84228/new/

https://reviews.llvm.org/D84228