[PATCH] [SCEV] Look at backedge dominating conditions.

[Sanjoy Das]

Hi atrick, hfinkel,

This change teaches ScalarEvolution::isLoopBackedgeGuardedByCond to look
at edges within the loop body that dominate the latch.  We don't do an
exhaustive search for all possible edges, but only a quick walk up the
dom tree.

http://reviews.llvm.org/D8627

Files:
  lib/Analysis/ScalarEvolution.cpp
  test/Analysis/ScalarEvolution/latch-dominating-conditions.ll

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