[PATCH] D23691: [PM] Introduce an abstraction for all the analyses over a particular IR unit for use in the PreservedAnalyses set.

[Chandler Carruth via llvm-commits]

chandlerc created this revision.
chandlerc added a subscriber: llvm-commits.
Herald added subscribers: mcrosier, mehdi_amini.

This doesn't have any important functional change yet but it cleans
things up and makes the analysis substantially more efficient by
avoiding querying through the type erasure for every analysis.

I also think it makes it much easier to reason about how analyses are
preserved when walking across pass managers and across IR unit
abstractions.

Suggestions on a better name for this set would be very, very welcome.
I don't particularly like this name but had no significant better ideas.

https://reviews.llvm.org/D23691

Files:
  include/llvm/IR/PassManager.h
  lib/IR/PassManager.cpp
  test/Other/new-pass-manager.ll

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