[PATCH] D27288: [GVN] When merging blocks update LoopInfo if it's available

[Adam Nemet via Phabricator via llvm-commits]

anemet created this revision.
anemet added reviewers: hfinkel, dberlin.
anemet added a subscriber: llvm-commits.
Herald added a subscriber: fhahn.

If LoopInfo is available during GVN, BasicAA will use it.  However
MergeBlockIntoPredecessor does not update LI as it merges blocks.

This didn't use to cause problems because LI was freed before
GVN/BasicAA.  Now with OptimizationRemarkEmitter, the lifetime of LI is
extended so LI needs to be kept up-to-date during GVN.


https://reviews.llvm.org/D27288

Files:
  include/llvm/Transforms/Scalar/GVN.h
  lib/Transforms/Scalar/GVN.cpp
  test/Transforms/GVN/stale-loop-info.ll

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