[PATCH] D45265: [PowerPC] Replace the Post RA List Scheduler with the Machine Scheduler

[Zixuan Wu via Phabricator via llvm-commits]

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I am curiosity about why Machine Scheduler is better than the List Scheduler after RA? 
As I see substitutePass is already used in 3 targets( AArch64,PPC,AMD), should PostMachineSchedulerID going to be the default PostRA Scheduler?


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https://reviews.llvm.org/D45265