[PATCH] D50426: [NFC][MustExecute] Rework API to start making better analysis

[Max Kazantsev via Phabricator via llvm-commits]

mkazantsev created this revision.
mkazantsev added reviewers: reames, skatkov.
Herald added a subscriber: zzheng.

We plan to make MustExecute analysis smarter in https://reviews.llvm.org/D50377, in particular
we want to be able to answer "is this Must Execute if the loop is entered?"
less conservatively for every loop block or instruction.

This patch reworks API just to make the functional change compact and
easier to review.


https://reviews.llvm.org/D50426

Files:
  include/llvm/Analysis/MustExecute.h
  lib/Analysis/MustExecute.cpp
  lib/Transforms/Scalar/LICM.cpp
  lib/Transforms/Scalar/LoopIdiomRecognize.cpp
  lib/Transforms/Scalar/LoopUnswitch.cpp
  lib/Transforms/Utils/LoopUnrollAndJam.cpp

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