[PATCH] Teach IRCE to look at branch weights when recognizing range checks

[Sanjoy Das]

Address Hal's comment and use BranchProbabilityInfo instead of manually parsing branch_weights metadata.


http://reviews.llvm.org/D7192

Files:
  lib/Transforms/Scalar/InductiveRangeCheckElimination.cpp
  test/Transforms/IRCE/multiple-access-no-preloop.ll
  test/Transforms/IRCE/not-likely-taken.ll
  test/Transforms/IRCE/single-access-no-preloop.ll
  test/Transforms/IRCE/single-access-with-preloop.ll
  test/Transforms/IRCE/with-parent-loops.ll

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