[PATCH] Make ScalarEvolution::ComputeExitLimit more agressive

[Sanjoy Das]

Hi reames, hfinkel, atrick, majnemer,

Test case included demonstrates a situation where this matters

http://reviews.llvm.org/D6830

Files:
  include/llvm/IR/BasicBlock.h
  lib/Analysis/ScalarEvolution.cpp
  lib/IR/BasicBlock.cpp
  test/Analysis/ScalarEvolution/compute-exit-limit-aggressively.ll

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